Repository: pingcap/dumpling
Pull request #315 (2021-07-15 13:31:26)

*: reduce dumpling accessing database and information_schema usage to improve its stability (#305)
This is an automated cherry-pick of #305

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### What problem does this PR solve? <!--add issue link with summary if exists-->
fix https://github.com/pingcap/dumpling/issues/298 and fix https://github.com/pingcap/dumpling/issues/296 and fix https://github.com/pingcap/dumpling/issues/310

### What is changed and how it works?
1. Try to dump the whole table directly if we meet some errors when we try to split tables into several chunks. https://github.com/pingcap/dumpling/commit/cfb258a98c791d07dab99e2f00519de23a375e1e
2. Reduce accessing `SelectedField` and `SelectedLen` info from database https://github.com/pingcap/dumpling/commit/d3ba1e8d7282a823b3b5548acd31eb0dc3081b19
3. Remove the usage of `information_schema` https://github.com/pingcap/dumpling/commit/1a0d9c4ecf46208ce0c8e88e19a5f4ae77f3a567, https://github.com/pingcap/dumpling/commit/7f7cf586cf99d5750c22834958cc17bd3b85b88e, https://github.com/pingcap/dumpling/commit/b333beaeb3ea898605bd2da5d9a11783eff4491e, https://github.com/pingcap/dumpling/commit/088b5ba98d3957369aa93856a3bc964960ced854, https://github.com/pingcap/dumpling/commit/7dac228759502c8ec79263968457e75f61bae381, https://github.com/pingcap/dumpling/commit/bdb3c26f4218cacbfc28c055c9e62c47cee784a6

4. Fix the bug that dumpling `finishedRows` is not accurate if we retry in chunks. https://github.com/pingcap/dumpling/commit/ff398a48a7800971011cb1ec476ecb7196676271
5. Fix the bug that dumpling dumps unlocked tables for consistency lock https://github.com/pingcap/dumpling/commit/7f7cf586cf99d5750c22834958cc17bd3b85b88e
6. Fix the bug of `no-schema` argument's wrong output https://github.com/pingcap/dumpling/commit/09d257dc54faaf36e1beb7079f5592cfdac9d117
  
### Check List <!--REMOVE the items that are not applicable-->

Tests <!-- At least one of them must be included. -->

 - Unit test
 - Integration test

Side effects

 - Increased code complexity

Related changes

 - Need to cherry-pick to the release branch
 
### Release note

<!-- bugfixes or new feature need a release note, must in the form of a list, such as

- support -T/--tables-list argument

or if no need to be included in the release note, just add the following line

- No release note
-->
- reduce dumpling accessing database and information_schema usage and improve dumpling's stability

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ti-chi-bot: [REVIEW NOTIFICATION]

This pull request has been approved by:

- lichunzhu




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lichunzhu: /merge
ti-chi-bot: This pull request has been accepted and is ready to merge. <details>Commit hash: 972a640913bc0b06b38ba19399734a5df3917ee7</details>
lichunzhu: /merge

Patch:
diff --git a/Makefile b/Makefile
index 545166e..108c118 100644
--- a/Makefile
+++ b/Makefile
@@ -96,6 +96,7 @@ static: tools
 		--disable gosec \
 		--disable errorlint \
 		--disable sqlclosecheck \
+		--disable scopelint \
 		$$($(PACKAGE_DIRECTORIES))
 	# pingcap/errors APIs are mixed with multiple patterns 'pkg/errors',
 	# 'juju/errors' and 'pingcap/parser'. To avoid confusion and mistake,
diff --git a/go.mod b/go.mod
index f91b95b..f52e726 100644
--- a/go.mod
+++ b/go.mod
@@ -22,9 +22,6 @@ require (
 	github.com/pingcap/tidb-tools v4.0.9-0.20201127090955-2707c97b3853+incompatible
 	github.com/prometheus/client_golang v1.5.1
 	github.com/prometheus/client_model v0.2.0
-	github.com/satori/go.uuid v1.2.1-0.20181028125025-b2ce2384e17b // indirect
-	github.com/siddontang/go-log v0.0.0-20190221022429-1e957dd83bed // indirect
-	github.com/siddontang/go-mysql v0.0.0-20200222075837-12e89848f047
 	github.com/soheilhy/cmux v0.1.4
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5
diff --git a/go.sum b/go.sum
index 61581c3..c79de3a 100644
--- a/go.sum
+++ b/go.sum
@@ -444,7 +444,6 @@ github.com/pingcap/log v0.0.0-20200511115504-543df19646ad/go.mod h1:4rbK1p9ILyIf
 github.com/pingcap/log v0.0.0-20201112100606-8f1e84a3abc8/go.mod h1:4rbK1p9ILyIfb6hU7OG2CiWSqMXnp3JMbiaVJ6mvoY8=
 github.com/pingcap/log v0.0.0-20210317133921-96f4fcab92a4 h1:ERrF0fTuIOnwfGbt71Ji3DKbOEaP189tjym50u8gpC8=
 github.com/pingcap/log v0.0.0-20210317133921-96f4fcab92a4/go.mod h1:4rbK1p9ILyIfb6hU7OG2CiWSqMXnp3JMbiaVJ6mvoY8=
-github.com/pingcap/parser v0.0.0-20190506092653-e336082eb825/go.mod h1:1FNvfp9+J0wvc4kl8eGNh7Rqrxveg15jJoWo/a0uHwA=
 github.com/pingcap/parser v0.0.0-20210513020953-ae2c4497c07b h1:eLuDQ6eJCEKCbGwhGrkjzagwev1GJGU2Y2kFkAsBzV0=
 github.com/pingcap/parser v0.0.0-20210513020953-ae2c4497c07b/go.mod h1:xZC8I7bug4GJ5KtHhgAikjTfU4kBv1Sbo3Pf1MZ6lVw=
 github.com/pingcap/sysutil v0.0.0-20200206130906-2bfa6dc40bcd/go.mod h1:EB/852NMQ+aRKioCpToQ94Wl7fktV+FNnxf3CX/TTXI=
@@ -455,7 +454,6 @@ github.com/pingcap/tidb v1.1.0-beta.0.20210517044538-8ad868f801fc/go.mod h1:MTGi
 github.com/pingcap/tidb-dashboard v0.0.0-20210312062513-eef5d6404638/go.mod h1:OzFN8H0EDMMqeulPhPMw2i2JaiZWOKFQ7zdRPhENNgo=
 github.com/pingcap/tidb-tools v4.0.9-0.20201127090955-2707c97b3853+incompatible h1:ceznmu/lLseGHP/jKyOa/3u/5H3wtLLLqkH2V3ssSjg=
 github.com/pingcap/tidb-tools v4.0.9-0.20201127090955-2707c97b3853+incompatible/go.mod h1:XGdcy9+yqlDSEMTpOXnwf3hiTeqrV6MN/u1se9N8yIM=
-github.com/pingcap/tipb v0.0.0-20190428032612-535e1abaa330/go.mod h1:RtkHW8WbcNxj8lsbzjaILci01CtYnYbIkQhjyZWrWVI=
 github.com/pingcap/tipb v0.0.0-20210422074242-57dd881b81b1 h1:Kcp3jIcQrqG+pT1JQ0oWyRncVKQtDgnMFzRt3zJBaBo=
 github.com/pingcap/tipb v0.0.0-20210422074242-57dd881b81b1/go.mod h1:nsEhnMokcn7MRqd2J60yxpn/ac3ZH8A6GOJ9NslabUo=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
@@ -504,30 +502,19 @@ github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/sasha-s/go-deadlock v0.2.0/go.mod h1:StQn567HiB1fF2yJ44N9au7wOhrPS3iZqiDbRupzT10=
 github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
-github.com/satori/go.uuid v1.2.1-0.20181028125025-b2ce2384e17b h1:gQZ0qzfKHQIybLANtM3mBXNUtOfsCFXeTsnBqCsx1KM=
-github.com/satori/go.uuid v1.2.1-0.20181028125025-b2ce2384e17b/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
 github.com/sergi/go-diff v1.0.1-0.20180205163309-da645544ed44/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
 github.com/sergi/go-diff v1.1.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
 github.com/shirou/gopsutil v2.19.10+incompatible/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=
 github.com/shirou/gopsutil v3.21.2+incompatible h1:U+YvJfjCh6MslYlIAXvPtzhW3YZEtc9uncueUNpD/0A=
 github.com/shirou/gopsutil v3.21.2+incompatible/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=
 github.com/shirou/w32 v0.0.0-20160930032740-bb4de0191aa4/go.mod h1:qsXQc7+bwAM3Q1u/4XEfrquwF8Lw7D7y5cD8CuHnfIc=
-github.com/shopspring/decimal v0.0.0-20180709203117-cd690d0c9e24/go.mod h1:M+9NzErvs504Cn4c5DxATwIqPbtswREoFCre64PpcG4=
 github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749 h1:bUGsEnyNbVPw06Bs80sCeARAlK8lhwqGyi6UT8ymuGk=
 github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749/go.mod h1:ZY1cvUeJuFPAdZ/B6v7RHavJWZn2YPVFQ1OSXhCGOkg=
 github.com/shurcooL/httpgzip v0.0.0-20190720172056-320755c1c1b0/go.mod h1:919LwcH0M7/W4fcZ0/jy0qGght1GIhqyS/EgWGH2j5Q=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/shurcooL/vfsgen v0.0.0-20181202132449-6a9ea43bcacd h1:ug7PpSOB5RBPK1Kg6qskGBoP3Vnj/aNYFTznWvlkGo0=
 github.com/shurcooL/vfsgen v0.0.0-20181202132449-6a9ea43bcacd/go.mod h1:TrYk7fJVaAttu97ZZKrO9UbRa8izdowaMIZcxYMbVaw=
-github.com/siddontang/go v0.0.0-20180604090527-bdc77568d726 h1:xT+JlYxNGqyT+XcU8iUrN18JYed2TvG9yN5ULG2jATM=
-github.com/siddontang/go v0.0.0-20180604090527-bdc77568d726/go.mod h1:3yhqj7WBBfRhbBlzyOC3gUxftwsU0u8gqevxwIHQpMw=
-github.com/siddontang/go-log v0.0.0-20180807004314-8d05993dda07/go.mod h1:yFdBgwXP24JziuRl2NMUahT7nGLNOKi1SIiFxMttVD4=
-github.com/siddontang/go-log v0.0.0-20190221022429-1e957dd83bed h1:KMgQoLJGCq1IoZpLZE3AIffh9veYWoVlsvA4ib55TMM=
-github.com/siddontang/go-log v0.0.0-20190221022429-1e957dd83bed/go.mod h1:yFdBgwXP24JziuRl2NMUahT7nGLNOKi1SIiFxMttVD4=
-github.com/siddontang/go-mysql v0.0.0-20200222075837-12e89848f047 h1:boyJ8EgQN/aC3grvx8QUoJrptt7RvneezSJSCbW25a4=
-github.com/siddontang/go-mysql v0.0.0-20200222075837-12e89848f047/go.mod h1:+W4RCzesQDI11HvIkaDjS8yM36SpAnGNQ7jmTLn5BnU=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
-github.com/sirupsen/logrus v1.4.1/go.mod h1:ni0Sbl8bgC9z8RoU9G6nDWqqs/fq4eDPysMBDgk/93Q=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
 github.com/sirupsen/logrus v1.6.0 h1:UBcNElsrwanuuMsnGSlYmtmgbb23qDR5dG+6X6Oo89I=
 github.com/sirupsen/logrus v1.6.0/go.mod h1:7uNnSEd1DgxDLC74fIahvMZmmYsHGZGEOFrfsX/uA88=
diff --git a/v4/export/block_allow_list.go b/v4/export/block_allow_list.go
index 2ce57eb..381bea6 100644
--- a/v4/export/block_allow_list.go
+++ b/v4/export/block_allow_list.go
@@ -9,13 +9,17 @@ import (
 )
 
 func filterTables(tctx *tcontext.Context, conf *Config) {
+	filterTablesFunc(tctx, conf, conf.TableFilter.MatchTable)
+}
+
+func filterTablesFunc(tctx *tcontext.Context, conf *Config, matchTable func(string, string) bool) {
 	tctx.L().Debug("start to filter tables")
 	dbTables := DatabaseTables{}
 	ignoredDBTable := DatabaseTables{}
 
 	for dbName, tables := range conf.Tables {
 		for _, table := range tables {
-			if conf.TableFilter.MatchTable(dbName, table.Name) {
+			if matchTable(dbName, table.Name) {
 				dbTables.AppendTable(dbName, table)
 			} else {
 				ignoredDBTable.AppendTable(dbName, table)
diff --git a/v4/export/consistency.go b/v4/export/consistency.go
index 0c418ff..68fbea0 100644
--- a/v4/export/consistency.go
+++ b/v4/export/consistency.go
@@ -34,8 +34,8 @@ func NewConsistencyController(ctx context.Context, conf *Config, session *sql.DB
 		}, nil
 	case consistencyTypeLock:
 		return &ConsistencyLockDumpingTables{
-			conn:      conn,
-			allTables: conf.Tables,
+			conn: conn,
+			conf: conf,
 		}, nil
 	case consistencyTypeSnapshot:
 		if conf.ServerInfo.ServerType != ServerTypeTiDB {
@@ -110,16 +110,28 @@ func (c *ConsistencyFlushTableWithReadLock) PingContext(ctx context.Context) err
 
 // ConsistencyLockDumpingTables execute lock tables read on all tables before dump
 type ConsistencyLockDumpingTables struct {
-	conn      *sql.Conn
-	allTables DatabaseTables
+	conn *sql.Conn
+	conf *Config
 }
 
 // Setup implements ConsistencyController.Setup
 func (c *ConsistencyLockDumpingTables) Setup(tctx *tcontext.Context) error {
 	blockList := make(map[string]map[string]interface{})
 	return utils.WithRetry(tctx, func() error {
-		lockTablesSQL := buildLockTablesSQL(c.allTables, blockList)
+		lockTablesSQL := buildLockTablesSQL(c.conf.Tables, blockList)
 		_, err := c.conn.ExecContext(tctx, lockTablesSQL)
+		if err == nil {
+			if len(blockList) > 0 {
+				filterTablesFunc(tctx, c.conf, func(db string, tbl string) bool {
+					if blockTable, ok := blockList[db]; ok {
+						if _, ok := blockTable[tbl]; ok {
+							return false
+						}
+					}
+					return true
+				})
+			}
+		}
 		return errors.Trace(err)
 	}, newLockTablesBackoffer(tctx, blockList))
 }
diff --git a/v4/export/dump.go b/v4/export/dump.go
index 947f187..5244f82 100755
--- a/v4/export/dump.go
+++ b/v4/export/dump.go
@@ -213,12 +213,6 @@ func (d *Dumper) Dump() (dumpErr error) {
 		}
 	})
 
-	// get estimate total count
-	err = d.getEstimateTotalRowsCount(tctx, metaConn)
-	if err != nil {
-		tctx.L().Error("fail to get estimate total count", zap.Error(err))
-	}
-
 	if conf.SQL == "" {
 		if err = d.dumpDatabases(writerCtx, metaConn, taskChan); err != nil && !errors.ErrorEqual(err, context.Canceled) {
 			return err
@@ -227,6 +221,7 @@ func (d *Dumper) Dump() (dumpErr error) {
 		d.dumpSQL(writerCtx, taskChan)
 	}
 	close(taskChan)
+	_ = metaConn.Close()
 	if err := wg.Wait(); err != nil {
 		summary.CollectFailureUnit("dump table data", err)
 		return errors.Trace(err)
@@ -286,14 +281,16 @@ func (d *Dumper) dumpDatabases(tctx *tcontext.Context, metaConn *sql.Conn, taskC
 	conf := d.conf
 	allTables := conf.Tables
 	for dbName, tables := range allTables {
-		createDatabaseSQL, err := ShowCreateDatabase(metaConn, dbName)
-		if err != nil {
-			return err
-		}
-		task := NewTaskDatabaseMeta(dbName, createDatabaseSQL)
-		ctxDone := d.sendTaskToChan(tctx, task, taskChan)
-		if ctxDone {
-			return tctx.Err()
+		if !conf.NoSchemas {
+			createDatabaseSQL, err := ShowCreateDatabase(metaConn, dbName)
+			if err != nil {
+				return err
+			}
+			task := NewTaskDatabaseMeta(dbName, createDatabaseSQL)
+			ctxDone := d.sendTaskToChan(tctx, task, taskChan)
+			if ctxDone {
+				return tctx.Err()
+			}
 		}
 
 		for _, table := range tables {
@@ -304,18 +301,22 @@ func (d *Dumper) dumpDatabases(tctx *tcontext.Context, metaConn *sql.Conn, taskC
 				return err
 			}
 
-			if table.Type == TableTypeView {
-				task := NewTaskViewMeta(dbName, table.Name, meta.ShowCreateTable(), meta.ShowCreateView())
-				ctxDone = d.sendTaskToChan(tctx, task, taskChan)
-				if ctxDone {
-					return tctx.Err()
-				}
-			} else {
-				task := NewTaskTableMeta(dbName, table.Name, meta.ShowCreateTable())
-				ctxDone = d.sendTaskToChan(tctx, task, taskChan)
-				if ctxDone {
-					return tctx.Err()
+			if !conf.NoSchemas {
+				if table.Type == TableTypeView {
+					task := NewTaskViewMeta(dbName, table.Name, meta.ShowCreateTable(), meta.ShowCreateView())
+					ctxDone := d.sendTaskToChan(tctx, task, taskChan)
+					if ctxDone {
+						return tctx.Err()
+					}
+				} else {
+					task := NewTaskTableMeta(dbName, table.Name, meta.ShowCreateTable())
+					ctxDone := d.sendTaskToChan(tctx, task, taskChan)
+					if ctxDone {
+						return tctx.Err()
+					}
 				}
+			}
+			if table.Type == TableTypeBase {
 				err = d.dumpTableData(tctx, metaConn, meta, taskChan)
 				if err != nil {
 					return err
@@ -332,6 +333,12 @@ func (d *Dumper) dumpTableData(tctx *tcontext.Context, conn *sql.Conn, meta Tabl
 	if conf.NoData {
 		return nil
 	}
+
+	// Update total rows
+	fieldName, _ := pickupPossibleField(meta, conn)
+	c := estimateCount(tctx, meta.DatabaseName(), meta.TableName(), conn, fieldName, conf)
+	AddCounter(estimateTotalRowsCounter, conf.Labels, float64(c))
+
 	if conf.Rows == UnspecifiedSize {
 		return d.sequentialDumpTable(tctx, conn, meta, taskChan)
 	}
@@ -343,7 +350,7 @@ func (d *Dumper) buildConcatTask(tctx *tcontext.Context, conn *sql.Conn, meta Ta
 	errCh := make(chan error, 1)
 	go func() {
 		// adjust rows to suitable rows for this table
-		d.conf.Rows = GetSuitableRows(tctx, conn, meta.DatabaseName(), meta.TableName())
+		d.conf.Rows = GetSuitableRows(meta.AvgRowLength())
 		err := d.concurrentDumpTable(tctx, conn, meta, tableChan)
 		d.conf.Rows = UnspecifiedSize
 		if err != nil {
@@ -400,12 +407,9 @@ func (d *Dumper) buildConcatTask(tctx *tcontext.Context, conn *sql.Conn, meta Ta
 	}
 }
 
-func (d *Dumper) dumpWholeTableDirectly(tctx *tcontext.Context, conn *sql.Conn, meta TableMeta, taskChan chan<- Task, partition string, currentChunk, totalChunks int) error {
+func (d *Dumper) dumpWholeTableDirectly(tctx *tcontext.Context, meta TableMeta, taskChan chan<- Task, partition, orderByClause string, currentChunk, totalChunks int) error {
 	conf := d.conf
-	tableIR, err := SelectAllFromTable(conf, conn, meta, partition)
-	if err != nil {
-		return err
-	}
+	tableIR := SelectAllFromTable(conf, meta, partition, orderByClause)
 	task := NewTaskTableData(meta, tableIR, currentChunk, totalChunks)
 	ctxDone := d.sendTaskToChan(tctx, task, taskChan)
 	if ctxDone {
@@ -432,7 +436,11 @@ func (d *Dumper) sequentialDumpTable(tctx *tcontext.Context, conn *sql.Conn, met
 			zap.String("database", meta.DatabaseName()),
 			zap.String("table", meta.TableName()))
 	}
-	return d.dumpWholeTableDirectly(tctx, conn, meta, taskChan, "", 0, 1)
+	orderByClause, err := buildOrderByClause(conf, conn, meta.DatabaseName(), meta.TableName(), meta.HasImplicitRowID())
+	if err != nil {
+		return err
+	}
+	return d.dumpWholeTableDirectly(tctx, meta, taskChan, "", orderByClause, 0, 1)
 }
 
 // concurrentDumpTable tries to split table into several chunks to dump
@@ -443,26 +451,27 @@ func (d *Dumper) concurrentDumpTable(tctx *tcontext.Context, conn *sql.Conn, met
 		conf.ServerInfo.ServerVersion != nil &&
 		(conf.ServerInfo.ServerVersion.Compare(*tableSampleVersion) >= 0 ||
 			(conf.ServerInfo.HasTiKV && conf.ServerInfo.ServerVersion.Compare(*gcSafePointVersion) >= 0)) {
-		return d.concurrentDumpTiDBTables(tctx, conn, meta, taskChan)
+		err := d.concurrentDumpTiDBTables(tctx, conn, meta, taskChan)
+		// don't retry on context error and successful tasks
+		if err2 := errors.Cause(err); err2 == nil || err2 == context.DeadlineExceeded || err2 == context.Canceled {
+			return err
+		}
+		tctx.L().Warn("fallback to concurrent dump tables using rows due to tidb error",
+			zap.String("database", db), zap.String("table", tbl), zap.Error(err))
 	}
-	field, err := pickupPossibleField(db, tbl, conn, conf)
+
+	orderByClause, err := buildOrderByClause(conf, conn, db, tbl, meta.HasImplicitRowID())
 	if err != nil {
 		return err
 	}
-	if field == "" {
+
+	field, err := pickupPossibleField(meta, conn)
+	if err != nil || field == "" {
 		// skip split chunk logic if not found proper field
 		tctx.L().Warn("fallback to sequential dump due to no proper field",
-			zap.String("database", db), zap.String("table", tbl))
-		return d.dumpWholeTableDirectly(tctx, conn, meta, taskChan, "", 0, 1)
-	}
-
-	min, max, err := d.selectMinAndMaxIntValue(conn, db, tbl, field)
-	if err != nil {
-		return err
+			zap.String("database", db), zap.String("table", tbl), zap.Error(err))
+		return d.dumpWholeTableDirectly(tctx, meta, taskChan, "", orderByClause, 0, 1)
 	}
-	tctx.L().Debug("get int bounding values",
-		zap.String("lower", min.String()),
-		zap.String("upper", max.String()))
 
 	count := estimateCount(d.tctx, db, tbl, conn, field, conf)
 	tctx.L().Info("get estimated rows count",
@@ -476,9 +485,17 @@ func (d *Dumper) concurrentDumpTable(tctx *tcontext.Context, conn *sql.Conn, met
 			zap.Uint64("conf.rows", conf.Rows),
 			zap.String("database", db),
 			zap.String("table", tbl))
-		return d.dumpWholeTableDirectly(tctx, conn, meta, taskChan, "", 0, 1)
+		return d.dumpWholeTableDirectly(tctx, meta, taskChan, "", orderByClause, 0, 1)
 	}
 
+	min, max, err := d.selectMinAndMaxIntValue(conn, db, tbl, field)
+	if err != nil {
+		return err
+	}
+	tctx.L().Debug("get int bounding values",
+		zap.String("lower", min.String()),
+		zap.String("upper", max.String()))
+
 	// every chunk would have eventual adjustments
 	estimatedChunks := count / conf.Rows
 	estimatedStep := new(big.Int).Sub(max, min).Uint64()/estimatedChunks + 1
@@ -489,15 +506,7 @@ func (d *Dumper) concurrentDumpTable(tctx *tcontext.Context, conn *sql.Conn, met
 		totalChunks = new(big.Int).Sub(max, min).Uint64() + 1
 	}
 
-	selectField, selectLen, err := buildSelectField(conn, db, tbl, conf.CompleteInsert)
-	if err != nil {
-		return err
-	}
-
-	orderByClause, err := buildOrderByClause(conf, conn, db, tbl)
-	if err != nil {
-		return err
-	}
+	selectField, selectLen := meta.SelectedField(), meta.SelectedLen()
 
 	chunkIndex := 0
 	nullValueCondition := ""
@@ -581,7 +590,7 @@ func (d *Dumper) concurrentDumpTiDBTables(tctx *tcontext.Context, conn *sql.Conn
 	if d.conf.ServerInfo.ServerVersion.Compare(*tableSampleVersion) >= 0 {
 		tctx.L().Debug("dumping TiDB tables with TABLESAMPLE",
 			zap.String("database", db), zap.String("table", tbl))
-		handleColNames, handleVals, err = selectTiDBTableSample(tctx, conn, db, tbl)
+		handleColNames, handleVals, err = selectTiDBTableSample(tctx, conn, meta)
 	} else {
 		tctx.L().Debug("dumping TiDB tables with TABLE REGIONS",
 			zap.String("database", db), zap.String("table", tbl))
@@ -589,7 +598,7 @@ func (d *Dumper) concurrentDumpTiDBTables(tctx *tcontext.Context, conn *sql.Conn
 		partitions, err = GetPartitionNames(conn, db, tbl)
 		if err == nil {
 			if len(partitions) == 0 {
-				handleColNames, handleVals, err = selectTiDBTableRegion(tctx, conn, db, tbl)
+				handleColNames, handleVals, err = selectTiDBTableRegion(tctx, conn, meta)
 			} else {
 				return d.concurrentDumpTiDBPartitionTables(tctx, conn, meta, taskChan, partitions)
 			}
@@ -598,7 +607,7 @@ func (d *Dumper) concurrentDumpTiDBTables(tctx *tcontext.Context, conn *sql.Conn
 	if err != nil {
 		return err
 	}
-	return d.sendConcurrentDumpTiDBTasks(tctx, conn, meta, taskChan, handleColNames, handleVals, "", 0, len(handleVals)+1)
+	return d.sendConcurrentDumpTiDBTasks(tctx, meta, taskChan, handleColNames, handleVals, "", 0, len(handleVals)+1)
 }
 
 func (d *Dumper) concurrentDumpTiDBPartitionTables(tctx *tcontext.Context, conn *sql.Conn, meta TableMeta, taskChan chan<- Task, partitions []string) error {
@@ -610,7 +619,7 @@ func (d *Dumper) concurrentDumpTiDBPartitionTables(tctx *tcontext.Context, conn
 	totalChunk := 0
 	cachedHandleVals := make([][][]string, len(partitions))
 
-	handleColNames, _, err := selectTiDBRowKeyFields(conn, db, tbl, checkTiDBTableRegionPkFields)
+	handleColNames, _, err := selectTiDBRowKeyFields(conn, meta, checkTiDBTableRegionPkFields)
 	if err != nil {
 		return err
 	}
@@ -624,7 +633,7 @@ func (d *Dumper) concurrentDumpTiDBPartitionTables(tctx *tcontext.Context, conn
 		cachedHandleVals[i] = handleVals
 	}
 	for i, partition := range partitions {
-		err := d.sendConcurrentDumpTiDBTasks(tctx, conn, meta, taskChan, handleColNames, cachedHandleVals[i], partition, startChunkIdx, totalChunk)
+		err := d.sendConcurrentDumpTiDBTasks(tctx, meta, taskChan, handleColNames, cachedHandleVals[i], partition, startChunkIdx, totalChunk)
 		if err != nil {
 			return err
 		}
@@ -634,17 +643,18 @@ func (d *Dumper) concurrentDumpTiDBPartitionTables(tctx *tcontext.Context, conn
 }
 
 func (d *Dumper) sendConcurrentDumpTiDBTasks(tctx *tcontext.Context,
-	conn *sql.Conn, meta TableMeta, taskChan chan<- Task,
+	meta TableMeta, taskChan chan<- Task,
 	handleColNames []string, handleVals [][]string, partition string, startChunkIdx, totalChunk int) error {
+	db, tbl := meta.DatabaseName(), meta.TableName()
 	if len(handleVals) == 0 {
-		return d.dumpWholeTableDirectly(tctx, conn, meta, taskChan, partition, startChunkIdx, totalChunk)
+		if partition == "" {
+			// return error to make outside function try using rows method to dump data
+			return errors.Errorf("empty handleVals for TiDB table `%s`.`%s`", escapeString(db), escapeString(tbl))
+		}
+		return d.dumpWholeTableDirectly(tctx, meta, taskChan, partition, buildOrderByClauseString(handleColNames), startChunkIdx, totalChunk)
 	}
 	conf := d.conf
-	db, tbl := meta.DatabaseName(), meta.TableName()
-	selectField, selectLen, err := buildSelectField(conn, db, tbl, conf.CompleteInsert)
-	if err != nil {
-		return err
-	}
+	selectField, selectLen := meta.SelectedField(), meta.SelectedLen()
 	where := buildWhereClauses(handleColNames, handleVals)
 	orderByClause := buildOrderByClauseString(handleColNames)
 
@@ -664,13 +674,13 @@ func (d *Dumper) L() log.Logger {
 	return d.tctx.L()
 }
 
-func selectTiDBTableSample(tctx *tcontext.Context, conn *sql.Conn, dbName, tableName string) (pkFields []string, pkVals [][]string, err error) {
-	pkFields, pkColTypes, err := selectTiDBRowKeyFields(conn, dbName, tableName, nil)
+func selectTiDBTableSample(tctx *tcontext.Context, conn *sql.Conn, meta TableMeta) (pkFields []string, pkVals [][]string, err error) {
+	pkFields, pkColTypes, err := selectTiDBRowKeyFields(conn, meta, nil)
 	if err != nil {
 		return nil, nil, errors.Trace(err)
 	}
 
-	query := buildTiDBTableSampleQuery(pkFields, dbName, tableName)
+	query := buildTiDBTableSampleQuery(pkFields, meta.DatabaseName(), meta.TableName())
 	rows, err := conn.QueryContext(tctx, query)
 	if err != nil {
 		return nil, nil, errors.Trace(err)
@@ -709,15 +719,11 @@ func buildTiDBTableSampleQuery(pkFields []string, dbName, tblName string) string
 	return fmt.Sprintf(template, pks, escapeString(dbName), escapeString(tblName), pks)
 }
 
-func selectTiDBRowKeyFields(conn *sql.Conn, dbName, tableName string, checkPkFields func([]string, []string) error) (pkFields, pkColTypes []string, err error) {
-	hasImplicitRowID, err := SelectTiDBRowID(conn, dbName, tableName)
-	if err != nil {
-		return
-	}
-	if hasImplicitRowID {
+func selectTiDBRowKeyFields(conn *sql.Conn, meta TableMeta, checkPkFields func([]string, []string) error) (pkFields, pkColTypes []string, err error) {
+	if meta.HasImplicitRowID() {
 		pkFields, pkColTypes = []string{"_tidb_rowid"}, []string{"BIGINT"}
 	} else {
-		pkFields, pkColTypes, err = GetPrimaryKeyAndColumnTypes(conn, dbName, tableName)
+		pkFields, pkColTypes, err = GetPrimaryKeyAndColumnTypes(conn, meta)
 		if err == nil {
 			if checkPkFields != nil {
 				err = checkPkFields(pkFields, pkColTypes)
@@ -738,8 +744,8 @@ func checkTiDBTableRegionPkFields(pkFields, pkColTypes []string) (err error) {
 	return
 }
 
-func selectTiDBTableRegion(tctx *tcontext.Context, conn *sql.Conn, dbName, tableName string) (pkFields []string, pkVals [][]string, err error) {
-	pkFields, _, err = selectTiDBRowKeyFields(conn, dbName, tableName, checkTiDBTableRegionPkFields)
+func selectTiDBTableRegion(tctx *tcontext.Context, conn *sql.Conn, meta TableMeta) (pkFields []string, pkVals [][]string, err error) {
+	pkFields, _, err = selectTiDBRowKeyFields(conn, meta, checkTiDBTableRegionPkFields)
 	if err != nil {
 		return
 	}
@@ -752,6 +758,7 @@ func selectTiDBTableRegion(tctx *tcontext.Context, conn *sql.Conn, dbName, table
 		tableRegionSQL = "SELECT START_KEY,tidb_decode_key(START_KEY) from INFORMATION_SCHEMA.TIKV_REGION_STATUS s WHERE s.DB_NAME = ? AND s.TABLE_NAME = ? AND IS_INDEX = 0 ORDER BY START_KEY;"
 		tidbRowID      = "_tidb_rowid="
 	)
+	dbName, tableName := meta.DatabaseName(), meta.TableName()
 	logger := tctx.L().With(zap.String("database", dbName), zap.String("table", tableName))
 	err = simpleQueryWithArgs(conn, func(rows *sql.Rows) error {
 		rowID++
@@ -816,7 +823,7 @@ func selectTiDBPartitionRegion(tctx *tcontext.Context, conn *sql.Conn, dbName, t
 		}
 	}
 
-	return pkVals, err
+	return pkVals, nil
 }
 
 func extractTiDBRowIDFromDecodedKey(indexField, key string) (string, error) {
@@ -833,31 +840,38 @@ func prepareTableListToDump(tctx *tcontext.Context, conf *Config, db *sql.Conn)
 		return err
 	}
 
-	conf.Tables, err = listAllTables(db, databases)
+	tableTypes := []TableType{TableTypeBase}
+	if !conf.NoViews {
+		tableTypes = append(tableTypes, TableTypeView)
+	}
+	// for consistency lock, we need to build the tables to dump as soon as possible
+	asap := conf.Consistency == consistencyTypeLock
+	conf.Tables, err = ListAllDatabasesTables(tctx, db, databases, asap, tableTypes...)
 	if err != nil {
 		return err
 	}
 
-	if !conf.NoViews {
-		views, err := listAllViews(db, databases)
-		if err != nil {
-			return err
-		}
-		conf.Tables.Merge(views)
-	}
-
 	filterTables(tctx, conf)
 	return nil
 }
 
 func dumpTableMeta(conf *Config, conn *sql.Conn, db string, table *TableInfo) (TableMeta, error) {
 	tbl := table.Name
-	selectField, _, err := buildSelectField(conn, db, tbl, conf.CompleteInsert)
+	selectField, selectLen, err := buildSelectField(conn, db, tbl, conf.CompleteInsert)
 	if err != nil {
 		return nil, err
 	}
+	var (
+		colTypes         []*sql.ColumnType
+		hasImplicitRowID bool
+	)
+	if conf.ServerInfo.ServerType == ServerTypeTiDB {
+		hasImplicitRowID, err = SelectTiDBRowID(conn, db, tbl)
+		if err != nil {
+			return nil, err
+		}
+	}
 
-	var colTypes []*sql.ColumnType
 	// If all columns are generated
 	if selectField == "" {
 		colTypes, err = GetColumnTypes(conn, "*", db, tbl)
@@ -869,10 +883,13 @@ func dumpTableMeta(conf *Config, conn *sql.Conn, db string, table *TableInfo) (T
 	}
 
 	meta := &tableMeta{
-		database:      db,
-		table:         tbl,
-		colTypes:      colTypes,
-		selectedField: selectField,
+		avgRowLength:     table.AvgRowLength,
+		database:         db,
+		table:            tbl,
+		colTypes:         colTypes,
+		selectedField:    selectField,
+		selectedLen:      selectLen,
+		hasImplicitRowID: hasImplicitRowID,
 		specCmts: []string{
 			"/*!40101 SET NAMES binary*/;",
 		},
diff --git a/v4/export/ir.go b/v4/export/ir.go
index 2b1d8d0..35e6614 100644
--- a/v4/export/ir.go
+++ b/v4/export/ir.go
@@ -29,9 +29,12 @@ type TableMeta interface {
 	ColumnTypes() []string
 	ColumnNames() []string
 	SelectedField() string
+	SelectedLen() int
 	SpecialComments() StringIter
 	ShowCreateTable() string
 	ShowCreateView() string
+	AvgRowLength() uint64
+	HasImplicitRowID() bool
 }
 
 // SQLRowIter is the iterator on a collection of sql.Row.
@@ -98,6 +101,7 @@ func setTableMetaFromRows(rows *sql.Rows) (TableMeta, error) {
 	return &tableMeta{
 		colTypes:      tps,
 		selectedField: strings.Join(nms, ","),
+		selectedLen:   len(nms),
 		specCmts:      []string{"/*!40101 SET NAMES binary*/;"},
 	}, nil
 }
diff --git a/v4/export/ir_impl.go b/v4/export/ir_impl.go
index ee5e01d..8170a1c 100644
--- a/v4/export/ir_impl.go
+++ b/v4/export/ir_impl.go
@@ -4,7 +4,6 @@ package export
 
 import (
 	"database/sql"
-	"fmt"
 	"strings"
 
 	"github.com/pingcap/errors"
@@ -250,13 +249,16 @@ func (td *tableData) RawRows() *sql.Rows {
 }
 
 type tableMeta struct {
-	database        string
-	table           string
-	colTypes        []*sql.ColumnType
-	selectedField   string
-	specCmts        []string
-	showCreateTable string
-	showCreateView  string
+	database         string
+	table            string
+	colTypes         []*sql.ColumnType
+	selectedField    string
+	selectedLen      int
+	specCmts         []string
+	showCreateTable  string
+	showCreateView   string
+	avgRowLength     uint64
+	hasImplicitRowID bool
 }
 
 func (tm *tableMeta) ColumnTypes() []string {
@@ -288,10 +290,11 @@ func (tm *tableMeta) ColumnCount() uint {
 }
 
 func (tm *tableMeta) SelectedField() string {
-	if tm.selectedField == "*" || tm.selectedField == "" {
-		return tm.selectedField
-	}
-	return fmt.Sprintf("(%s)", tm.selectedField)
+	return tm.selectedField
+}
+
+func (tm *tableMeta) SelectedLen() int {
+	return tm.selectedLen
 }
 
 func (tm *tableMeta) SpecialComments() StringIter {
@@ -306,6 +309,14 @@ func (tm *tableMeta) ShowCreateView() string {
 	return tm.showCreateView
 }
 
+func (tm *tableMeta) AvgRowLength() uint64 {
+	return tm.avgRowLength
+}
+
+func (tm *tableMeta) HasImplicitRowID() bool {
+	return tm.hasImplicitRowID
+}
+
 type metaData struct {
 	target   string
 	metaSQL  string
diff --git a/v4/export/metrics.go b/v4/export/metrics.go
index a2d671d..cb62caf 100644
--- a/v4/export/metrics.go
+++ b/v4/export/metrics.go
@@ -10,8 +10,8 @@ import (
 )
 
 var (
-	finishedSizeCounter            *prometheus.CounterVec
-	finishedRowsCounter            *prometheus.CounterVec
+	finishedSizeGauge              *prometheus.GaugeVec
+	finishedRowsGauge              *prometheus.GaugeVec
 	finishedTablesCounter          *prometheus.CounterVec
 	estimateTotalRowsCounter       *prometheus.CounterVec
 	writeTimeHistogram             *prometheus.HistogramVec
@@ -27,8 +27,8 @@ func InitMetricsVector(labels prometheus.Labels) {
 	for name := range labels {
 		labelNames = append(labelNames, name)
 	}
-	finishedSizeCounter = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
+	finishedSizeGauge = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
 			Namespace: "dumpling",
 			Subsystem: "dump",
 			Name:      "finished_size",
@@ -41,8 +41,8 @@ func InitMetricsVector(labels prometheus.Labels) {
 			Name:      "estimate_total_rows",
 			Help:      "estimate total rows for dumpling tables",
 		}, labelNames)
-	finishedRowsCounter = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
+	finishedRowsGauge = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
 			Namespace: "dumpling",
 			Subsystem: "dump",
 			Name:      "finished_rows",
@@ -89,11 +89,11 @@ func InitMetricsVector(labels prometheus.Labels) {
 
 // RegisterMetrics registers metrics.
 func RegisterMetrics(registry *prometheus.Registry) {
-	if finishedSizeCounter == nil {
+	if finishedSizeGauge == nil {
 		return
 	}
-	registry.MustRegister(finishedSizeCounter)
-	registry.MustRegister(finishedRowsCounter)
+	registry.MustRegister(finishedSizeGauge)
+	registry.MustRegister(finishedRowsGauge)
 	registry.MustRegister(estimateTotalRowsCounter)
 	registry.MustRegister(finishedTablesCounter)
 	registry.MustRegister(writeTimeHistogram)
@@ -104,11 +104,11 @@ func RegisterMetrics(registry *prometheus.Registry) {
 
 // RemoveLabelValuesWithTaskInMetrics removes metrics of specified labels.
 func RemoveLabelValuesWithTaskInMetrics(labels prometheus.Labels) {
-	if finishedSizeCounter == nil {
+	if finishedSizeGauge == nil {
 		return
 	}
-	finishedSizeCounter.Delete(labels)
-	finishedRowsCounter.Delete(labels)
+	finishedSizeGauge.Delete(labels)
+	finishedRowsGauge.Delete(labels)
 	estimateTotalRowsCounter.Delete(labels)
 	finishedTablesCounter.Delete(labels)
 	writeTimeHistogram.Delete(labels)
@@ -154,6 +154,19 @@ func ObserveHistogram(histogramVec *prometheus.HistogramVec, labels prometheus.L
 	histogramVec.With(labels).Observe(v)
 }
 
+// ReadGauge reports the current value of the gauge.
+func ReadGauge(gaugeVec *prometheus.GaugeVec, labels prometheus.Labels) float64 {
+	if gaugeVec == nil {
+		return math.NaN()
+	}
+	gauge := gaugeVec.With(labels)
+	var metric dto.Metric
+	if err := gauge.Write(&metric); err != nil {
+		return math.NaN()
+	}
+	return metric.Gauge.GetValue()
+}
+
 // AddGauge adds a gauge
 func AddGauge(gaugeVec *prometheus.GaugeVec, labels prometheus.Labels, v float64) {
 	if gaugeVec == nil {
@@ -162,6 +175,14 @@ func AddGauge(gaugeVec *prometheus.GaugeVec, labels prometheus.Labels, v float64
 	gaugeVec.With(labels).Add(v)
 }
 
+// SubGauge subs a gauge
+func SubGauge(gaugeVec *prometheus.GaugeVec, labels prometheus.Labels, v float64) {
+	if gaugeVec == nil {
+		return
+	}
+	gaugeVec.With(labels).Sub(v)
+}
+
 // IncGauge incs a gauge
 func IncGauge(gaugeVec *prometheus.GaugeVec, labels prometheus.Labels) {
 	if gaugeVec == nil {
diff --git a/v4/export/prepare.go b/v4/export/prepare.go
index 362ff7c..a8c1342 100644
--- a/v4/export/prepare.go
+++ b/v4/export/prepare.go
@@ -96,14 +96,6 @@ func prepareDumpingDatabases(conf *Config, db *sql.Conn) ([]string, error) {
 	return conf.Databases, nil
 }
 
-func listAllTables(db *sql.Conn, databaseNames []string) (DatabaseTables, error) {
-	return ListAllDatabasesTables(db, databaseNames, TableTypeBase)
-}
-
-func listAllViews(db *sql.Conn, databaseNames []string) (DatabaseTables, error) {
-	return ListAllDatabasesTables(db, databaseNames, TableTypeView)
-}
-
 type databaseName = string
 
 // TableType represents the type of table
@@ -116,10 +108,41 @@ const (
 	TableTypeView
 )
 
+const (
+	// TableTypeBaseStr represents the basic table string
+	TableTypeBaseStr = "BASE TABLE"
+	// TableTypeViewStr represents the view table string
+	TableTypeViewStr = "VIEW"
+)
+
+func (t TableType) String() string {
+	switch t {
+	case TableTypeBase:
+		return TableTypeBaseStr
+	case TableTypeView:
+		return TableTypeViewStr
+	default:
+		return "UNKNOWN"
+	}
+}
+
+// ParseTableType parses table type string to TableType
+func ParseTableType(s string) (TableType, error) {
+	switch s {
+	case TableTypeBaseStr:
+		return TableTypeBase, nil
+	case TableTypeViewStr:
+		return TableTypeView, nil
+	default:
+		return TableTypeBase, errors.Errorf("unknown table type %s", s)
+	}
+}
+
 // TableInfo is the table info for a table in database
 type TableInfo struct {
-	Name string
-	Type TableType
+	Name         string
+	AvgRowLength uint64
+	Type         TableType
 }
 
 // Equals returns true the table info is the same with another one
@@ -142,9 +165,9 @@ func (d DatabaseTables) AppendTable(dbName string, table *TableInfo) DatabaseTab
 }
 
 // AppendTables appends several basic tables to DatabaseTables
-func (d DatabaseTables) AppendTables(dbName string, tableNames ...string) DatabaseTables {
-	for _, t := range tableNames {
-		d[dbName] = append(d[dbName], &TableInfo{t, TableTypeBase})
+func (d DatabaseTables) AppendTables(dbName string, tableNames []string, avgRowLengths []uint64) DatabaseTables {
+	for i, t := range tableNames {
+		d[dbName] = append(d[dbName], &TableInfo{t, avgRowLengths[i], TableTypeBase})
 	}
 	return d
 }
@@ -152,7 +175,7 @@ func (d DatabaseTables) AppendTables(dbName string, tableNames ...string) Databa
 // AppendViews appends several views to DatabaseTables
 func (d DatabaseTables) AppendViews(dbName string, viewNames ...string) DatabaseTables {
 	for _, v := range viewNames {
-		d[dbName] = append(d[dbName], &TableInfo{v, TableTypeView})
+		d[dbName] = append(d[dbName], &TableInfo{v, 0, TableTypeView})
 	}
 	return d
 }
diff --git a/v4/export/sql.go b/v4/export/sql.go
index 655d9c2..5e37fa9 100644
--- a/v4/export/sql.go
+++ b/v4/export/sql.go
@@ -141,36 +141,91 @@ func RestoreCharset(w io.StringWriter) {
 }
 
 // ListAllDatabasesTables lists all the databases and tables from the database
-func ListAllDatabasesTables(db *sql.Conn, databaseNames []string, tableType TableType) (DatabaseTables, error) {
-	var tableTypeStr string
-	switch tableType {
-	case TableTypeBase:
-		tableTypeStr = "BASE TABLE"
-	case TableTypeView:
-		tableTypeStr = "VIEW"
-	default:
-		return nil, errors.Errorf("unknown table type %v", tableType)
-	}
-
-	query := fmt.Sprintf("SELECT table_schema,table_name FROM information_schema.tables WHERE table_type = '%s'", tableTypeStr)
+// if asap is true, will use information_schema to get table info in one query
+// if asap is false, will use show table status for each database because it has better performance according to our tests
+func ListAllDatabasesTables(tctx *tcontext.Context, db *sql.Conn, databaseNames []string, asap bool, tableTypes ...TableType) (DatabaseTables, error) { // revive:disable-line:flag-parameter
 	dbTables := DatabaseTables{}
-	for _, schema := range databaseNames {
-		dbTables[schema] = make([]*TableInfo, 0)
-	}
-
-	if err := simpleQueryWithArgs(db, func(rows *sql.Rows) error {
-		var schema, table string
-		if err := rows.Scan(&schema, &table); err != nil {
-			return errors.Trace(err)
+	var (
+		schema, table, tableTypeStr string
+		tableType                   TableType
+		avgRowLength                uint64
+		err                         error
+	)
+	if asap {
+		tableTypeConditions := make([]string, len(tableTypes))
+		for i, tableType := range tableTypes {
+			tableTypeConditions[i] = fmt.Sprintf("TABLE_TYPE='%s'", tableType)
 		}
+		query := fmt.Sprintf("SELECT TABLE_SCHEMA,TABLE_NAME,TABLE_TYPE,AVG_ROW_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE %s", strings.Join(tableTypeConditions, " OR "))
+		for _, schema := range databaseNames {
+			dbTables[schema] = make([]*TableInfo, 0)
+		}
+		if err = simpleQueryWithArgs(db, func(rows *sql.Rows) error {
+			var (
+				sqlAvgRowLength sql.NullInt64
+				err2            error
+			)
+			if err2 = rows.Scan(&schema, &table, &tableTypeStr, &sqlAvgRowLength); err != nil {
+				return errors.Trace(err2)
+			}
+			tableType, err2 = ParseTableType(tableTypeStr)
+			if err2 != nil {
+				return errors.Trace(err2)
+			}
 
-		// only append tables to schemas in databaseNames
-		if _, ok := dbTables[schema]; ok {
-			dbTables[schema] = append(dbTables[schema], &TableInfo{table, tableType})
+			if sqlAvgRowLength.Valid {
+				avgRowLength = uint64(sqlAvgRowLength.Int64)
+			} else {
+				avgRowLength = 0
+			}
+			// only append tables to schemas in databaseNames
+			if _, ok := dbTables[schema]; ok {
+				dbTables[schema] = append(dbTables[schema], &TableInfo{table, avgRowLength, tableType})
+			}
+			return nil
+		}, query); err != nil {
+			return nil, errors.Annotatef(err, "sql: %s", query)
+		}
+	} else {
+		queryTemplate := "SHOW TABLE STATUS FROM `%s`"
+		selectedTableType := make(map[TableType]struct{})
+		for _, tableType = range tableTypes {
+			selectedTableType[tableType] = struct{}{}
+		}
+		for _, schema = range databaseNames {
+			dbTables[schema] = make([]*TableInfo, 0)
+			query := fmt.Sprintf(queryTemplate, escapeString(schema))
+			rows, err := db.QueryContext(tctx, query)
+			if err != nil {
+				return nil, errors.Annotatef(err, "sql: %s", query)
+			}
+			results, err := GetSpecifiedColumnValuesAndClose(rows, "NAME", "ENGINE", "AVG_ROW_LENGTH", "COMMENT")
+			if err != nil {
+				return nil, errors.Annotatef(err, "sql: %s", query)
+			}
+			for _, oneRow := range results {
+				table, engine, avgRowLengthStr, comment := oneRow[0], oneRow[1], oneRow[2], oneRow[3]
+				if avgRowLengthStr != "" {
+					avgRowLength, err = strconv.ParseUint(avgRowLengthStr, 10, 64)
+					if err != nil {
+						return nil, errors.Annotatef(err, "sql: %s", query)
+					}
+				} else {
+					avgRowLength = 0
+				}
+				tableType = TableTypeBase
+				if engine == "" && (comment == "" || comment == TableTypeViewStr) {
+					tableType = TableTypeView
+				} else if engine == "" {
+					tctx.L().Warn("Invalid table without engine found", zap.String("database", schema), zap.String("table", table))
+					continue
+				}
+				if _, ok := selectedTableType[tableType]; !ok {
+					continue
+				}
+				dbTables[schema] = append(dbTables[schema], &TableInfo{table, avgRowLength, tableType})
+			}
 		}
-		return nil
-	}, query); err != nil {
-		return nil, errors.Annotatef(err, "sql: %s", query)
 	}
 	return dbTables, nil
 }
@@ -188,23 +243,15 @@ func SelectVersion(db *sql.DB) (string, error) {
 }
 
 // SelectAllFromTable dumps data serialized from a specified table
-func SelectAllFromTable(conf *Config, db *sql.Conn, meta TableMeta, partition string) (TableDataIR, error) {
+func SelectAllFromTable(conf *Config, meta TableMeta, partition, orderByClause string) TableDataIR {
 	database, table := meta.DatabaseName(), meta.TableName()
-	selectedField, selectLen, err := buildSelectField(db, database, table, conf.CompleteInsert)
-	if err != nil {
-		return nil, err
-	}
-
-	orderByClause, err := buildOrderByClause(conf, db, database, table)
-	if err != nil {
-		return nil, err
-	}
+	selectedField, selectLen := meta.SelectedField(), meta.SelectedLen()
 	query := buildSelectQuery(database, table, selectedField, partition, buildWhereCondition(conf, ""), orderByClause)
 
 	return &tableData{
 		query:  query,
 		colLen: selectLen,
-	}, nil
+	}
 }
 
 func buildSelectQuery(database, table, fields, partition, where, orderByClause string) string {
@@ -240,18 +287,12 @@ func buildSelectQuery(database, table, fields, partition, where, orderByClause s
 	return query.String()
 }
 
-func buildOrderByClause(conf *Config, db *sql.Conn, database, table string) (string, error) {
+func buildOrderByClause(conf *Config, db *sql.Conn, database, table string, hasImplicitRowID bool) (string, error) { // revive:disable-line:flag-parameter
 	if !conf.SortByPk {
 		return "", nil
 	}
-	if conf.ServerInfo.ServerType == ServerTypeTiDB {
-		ok, err := SelectTiDBRowID(db, database, table)
-		if err != nil {
-			return "", errors.Trace(err)
-		}
-		if ok {
-			return orderByTiDBRowID, nil
-		}
+	if hasImplicitRowID {
+		return orderByTiDBRowID, nil
 	}
 	cols, err := GetPrimaryKeyColumns(db, database, table)
 	if err != nil {
@@ -276,15 +317,13 @@ func SelectTiDBRowID(db *sql.Conn, database, table string) (bool, error) {
 }
 
 // GetSuitableRows gets suitable rows for each table
-func GetSuitableRows(tctx *tcontext.Context, db *sql.Conn, database, table string) uint64 {
+func GetSuitableRows(avgRowLength uint64) uint64 {
 	const (
 		defaultRows  = 200000
 		maxRows      = 1000000
 		bytesPerFile = 128 * 1024 * 1024 // 128MB per file by default
 	)
-	avgRowLength, err := GetAVGRowLength(tctx, db, database, table)
-	if err != nil || avgRowLength == 0 {
-		tctx.L().Debug("fail to get average row length", zap.Uint64("averageRowLength", avgRowLength), zap.Error(err))
+	if avgRowLength == 0 {
 		return defaultRows
 	}
 	estimateRows := bytesPerFile / avgRowLength
@@ -294,18 +333,6 @@ func GetSuitableRows(tctx *tcontext.Context, db *sql.Conn, database, table strin
 	return estimateRows
 }
 
-// GetAVGRowLength gets whether this table's average row length
-func GetAVGRowLength(tctx *tcontext.Context, db *sql.Conn, database, table string) (uint64, error) {
-	const query = "select AVG_ROW_LENGTH from INFORMATION_SCHEMA.TABLES where table_schema=? and table_name=?;"
-	var avgRowLength uint64
-	row := db.QueryRowContext(tctx, query, database, table)
-	err := row.Scan(&avgRowLength)
-	if err != nil {
-		return 0, errors.Annotatef(err, "sql: %s", query)
-	}
-	return avgRowLength, nil
-}
-
 // GetColumnTypes gets *sql.ColumnTypes from a specified table
 func GetColumnTypes(db *sql.Conn, fields, database, table string) ([]*sql.ColumnType, error) {
 	query := fmt.Sprintf("SELECT %s FROM `%s`.`%s` LIMIT 1", fields, escapeString(database), escapeString(table))
@@ -321,78 +348,68 @@ func GetColumnTypes(db *sql.Conn, fields, database, table string) ([]*sql.Column
 }
 
 // GetPrimaryKeyAndColumnTypes gets all primary columns and their types in ordinal order
-func GetPrimaryKeyAndColumnTypes(conn *sql.Conn, database, table string) ([]string, []string, error) {
-	query :=
-		`SELECT c.COLUMN_NAME, DATA_TYPE FROM
-INFORMATION_SCHEMA.COLUMNS c INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE k ON
-c.column_name = k.column_name and
-c.table_schema = k.table_schema and
-c.table_name = k.table_name and
-c.table_schema = ? and
-c.table_name = ?
-WHERE COLUMN_KEY = 'PRI'
-ORDER BY k.ORDINAL_POSITION;`
-	var colNames, colTypes []string
-	if err := simpleQueryWithArgs(conn, func(rows *sql.Rows) error {
-		var colName, colType string
-		if err := rows.Scan(&colName, &colType); err != nil {
-			return errors.Trace(err)
-		}
-		colNames = append(colNames, colName)
-		colTypes = append(colTypes, strings.ToUpper(colType))
-		return nil
-	}, query, database, table); err != nil {
-		return nil, nil, errors.Annotatef(err, "sql: %s", query)
+func GetPrimaryKeyAndColumnTypes(conn *sql.Conn, meta TableMeta) ([]string, []string, error) {
+	var (
+		colNames, colTypes []string
+		err                error
+	)
+	colNames, err = GetPrimaryKeyColumns(conn, meta.DatabaseName(), meta.TableName())
+	if err != nil {
+		return nil, nil, err
+	}
+	colName2Type := string2Map(meta.ColumnNames(), meta.ColumnTypes())
+	colTypes = make([]string, len(colNames))
+	for i, colName := range colNames {
+		colTypes[i] = colName2Type[colName]
 	}
 	return colNames, colTypes, nil
 }
 
 // GetPrimaryKeyColumns gets all primary columns in ordinal order
 func GetPrimaryKeyColumns(db *sql.Conn, database, table string) ([]string, error) {
-	priKeyColsQuery := "SELECT column_name FROM information_schema.KEY_COLUMN_USAGE " +
-		"WHERE table_schema = ? AND table_name = ? AND CONSTRAINT_NAME = 'PRIMARY' order by ORDINAL_POSITION;"
-	rows, err := db.QueryContext(context.Background(), priKeyColsQuery, database, table)
+	priKeyColsQuery := fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", escapeString(database), escapeString(table))
+	rows, err := db.QueryContext(context.Background(), priKeyColsQuery)
 	if err != nil {
 		return nil, errors.Annotatef(err, "sql: %s", priKeyColsQuery)
 	}
-	defer rows.Close()
-	var cols []string
-	var col string
-	for rows.Next() {
-		err = rows.Scan(&col)
-		if err != nil {
-			return nil, errors.Annotatef(err, "sql: %s", priKeyColsQuery)
-		}
-		cols = append(cols, col)
-	}
-	if err = rows.Err(); err != nil {
+	results, err := GetSpecifiedColumnValuesAndClose(rows, "KEY_NAME", "COLUMN_NAME")
+	if err != nil {
 		return nil, errors.Annotatef(err, "sql: %s", priKeyColsQuery)
 	}
+	cols := make([]string, 0, len(results))
+	for _, oneRow := range results {
+		keyName, columnName := oneRow[0], oneRow[1]
+		if keyName == "PRIMARY" {
+			cols = append(cols, columnName)
+		}
+	}
 	return cols, nil
 }
 
-// GetPrimaryKeyName try to get a numeric primary index
-func GetPrimaryKeyName(db *sql.Conn, database, table string) (string, error) {
-	return getNumericIndex(db, database, table, "PRI")
-}
-
-// GetUniqueIndexName try to get a numeric unique index
-func GetUniqueIndexName(db *sql.Conn, database, table string) (string, error) {
-	return getNumericIndex(db, database, table, "UNI")
-}
-
-func getNumericIndex(db *sql.Conn, database, table, indexType string) (string, error) {
-	keyQuery := "SELECT column_name FROM information_schema.columns " +
-		"WHERE table_schema = ? AND table_name = ? AND column_key = ? AND data_type IN ('int', 'bigint');"
-	var colName string
-	row := db.QueryRowContext(context.Background(), keyQuery, database, table, indexType)
-	err := row.Scan(&colName)
-	if errors.Cause(err) == sql.ErrNoRows {
-		return "", nil
-	} else if err != nil {
-		return "", errors.Annotatef(err, "sql: %s, indexType: %s", keyQuery, indexType)
+func getNumericIndex(db *sql.Conn, meta TableMeta) (string, error) {
+	database, table := meta.DatabaseName(), meta.TableName()
+	colName2Type := string2Map(meta.ColumnNames(), meta.ColumnTypes())
+	keyQuery := fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", escapeString(database), escapeString(table))
+	rows, err := db.QueryContext(context.Background(), keyQuery)
+	if err != nil {
+		return "", errors.Annotatef(err, "sql: %s", keyQuery)
+	}
+	results, err := GetSpecifiedColumnValuesAndClose(rows, "NON_UNIQUE", "KEY_NAME", "COLUMN_NAME")
+	if err != nil {
+		return "", errors.Annotatef(err, "sql: %s", keyQuery)
+	}
+	uniqueColumnName := ""
+	// check primary key first, then unique key
+	for _, oneRow := range results {
+		var ok bool
+		if _, ok = dataTypeNum[colName2Type[oneRow[2]]]; ok && oneRow[1] == "PRIMARY" {
+			return oneRow[2], nil
+		}
+		if uniqueColumnName != "" && oneRow[0] == "0" && ok {
+			uniqueColumnName = oneRow[2]
+		}
 	}
-	return colName, nil
+	return uniqueColumnName, nil
 }
 
 // FlushTableWithReadLock flush tables with read lock
@@ -473,6 +490,51 @@ func GetSpecifiedColumnValueAndClose(rows *sql.Rows, columnName string) ([]strin
 	return strs, errors.Trace(rows.Err())
 }
 
+// GetSpecifiedColumnValuesAndClose get columns' values whose name is equal to columnName
+func GetSpecifiedColumnValuesAndClose(rows *sql.Rows, columnName ...string) ([][]string, error) {
+	if rows == nil {
+		return [][]string{}, nil
+	}
+	defer rows.Close()
+	var strs [][]string
+	columns, err := rows.Columns()
+	if err != nil {
+		return strs, errors.Trace(err)
+	}
+	addr := make([]interface{}, len(columns))
+	oneRow := make([]sql.NullString, len(columns))
+	fieldIndexMp := make(map[int]int)
+	for i, col := range columns {
+		addr[i] = &oneRow[i]
+		for j, name := range columnName {
+			if strings.ToUpper(col) == name {
+				fieldIndexMp[i] = j
+			}
+		}
+	}
+	if len(fieldIndexMp) == 0 {
+		return strs, nil
+	}
+	for rows.Next() {
+		err := rows.Scan(addr...)
+		if err != nil {
+			return strs, errors.Trace(err)
+		}
+		written := false
+		tmpStr := make([]string, len(columnName))
+		for colPos, namePos := range fieldIndexMp {
+			if oneRow[colPos].Valid {
+				written = true
+				tmpStr[namePos] = oneRow[colPos].String
+			}
+		}
+		if written {
+			strs = append(strs, tmpStr)
+		}
+	}
+	return strs, errors.Trace(rows.Err())
+}
+
 // GetPdAddrs gets PD address from TiDB
 func GetPdAddrs(tctx *tcontext.Context, db *sql.DB) ([]string, error) {
 	query := "SELECT * FROM information_schema.cluster_info where type = 'pd';"
@@ -592,8 +654,8 @@ func createConnWithConsistency(ctx context.Context, db *sql.DB) (*sql.Conn, erro
 // buildSelectField returns the selecting fields' string(joined by comma(`,`)),
 // and the number of writable fields.
 func buildSelectField(db *sql.Conn, dbName, tableName string, completeInsert bool) (string, int, error) { // revive:disable-line:flag-parameter
-	query := `SELECT COLUMN_NAME,EXTRA FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA=? AND TABLE_NAME=? ORDER BY ORDINAL_POSITION;`
-	rows, err := db.QueryContext(context.Background(), query, dbName, tableName)
+	query := fmt.Sprintf("SHOW COLUMNS FROM `%s`.`%s`", escapeString(dbName), escapeString(tableName))
+	rows, err := db.QueryContext(context.Background(), query)
 	if err != nil {
 		return "", 0, errors.Annotatef(err, "sql: %s", query)
 	}
@@ -601,13 +663,12 @@ func buildSelectField(db *sql.Conn, dbName, tableName string, completeInsert boo
 	availableFields := make([]string, 0)
 
 	hasGenerateColumn := false
-	var fieldName string
-	var extra string
-	for rows.Next() {
-		err = rows.Scan(&fieldName, &extra)
-		if err != nil {
-			return "", 0, errors.Annotatef(err, "sql: %s", query)
-		}
+	results, err := GetSpecifiedColumnValuesAndClose(rows, "FIELD", "EXTRA")
+	if err != nil {
+		return "", 0, errors.Annotatef(err, "sql: %s", query)
+	}
+	for _, oneRow := range results {
+		fieldName, extra := oneRow[0], oneRow[1]
 		switch extra {
 		case "STORED GENERATED", "VIRTUAL GENERATED":
 			hasGenerateColumn = true
@@ -615,9 +676,6 @@ func buildSelectField(db *sql.Conn, dbName, tableName string, completeInsert boo
 		}
 		availableFields = append(availableFields, wrapBackTicks(escapeString(fieldName)))
 	}
-	if err = rows.Err(); err != nil {
-		return "", 0, errors.Annotatef(err, "sql: %s", query)
-	}
 	if completeInsert || hasGenerateColumn {
 		return strings.Join(availableFields, ","), len(availableFields), nil
 	}
@@ -830,29 +888,16 @@ func simpleQueryWithArgs(conn *sql.Conn, handleOneRow func(*sql.Rows) error, sql
 	return errors.Annotatef(rows.Err(), "sql: %s", sql)
 }
 
-func pickupPossibleField(dbName, tableName string, db *sql.Conn, conf *Config) (string, error) {
-	// If detected server is TiDB, try using _tidb_rowid
-	if conf.ServerInfo.ServerType == ServerTypeTiDB {
-		ok, err := SelectTiDBRowID(db, dbName, tableName)
-		if err != nil {
-			return "", nil
-		}
-		if ok {
-			return "_tidb_rowid", nil
-		}
+func pickupPossibleField(meta TableMeta, db *sql.Conn) (string, error) {
+	// try using _tidb_rowid first
+	if meta.HasImplicitRowID() {
+		return "_tidb_rowid", nil
 	}
 	// try to use pk
-	fieldName, err := GetPrimaryKeyName(db, dbName, tableName)
+	fieldName, err := getNumericIndex(db, meta)
 	if err != nil {
 		return "", err
 	}
-	// try to use first uniqueIndex
-	if fieldName == "" {
-		fieldName, err = GetUniqueIndexName(db, dbName, tableName)
-		if err != nil {
-			return "", err
-		}
-	}
 
 	// if fieldName == "", there is no proper index
 	return fieldName, nil
diff --git a/v4/export/status.go b/v4/export/status.go
index 909469c..7c36878 100644
--- a/v4/export/status.go
+++ b/v4/export/status.go
@@ -3,7 +3,6 @@
 package export
 
 import (
-	"database/sql"
 	"fmt"
 	"time"
 
@@ -31,8 +30,8 @@ func (d *Dumper) runLogProgress(tctx *tcontext.Context) {
 			nanoseconds := float64(time.Since(lastCheckpoint).Nanoseconds())
 
 			completedTables := ReadCounter(finishedTablesCounter, conf.Labels)
-			finishedBytes := ReadCounter(finishedSizeCounter, conf.Labels)
-			finishedRows := ReadCounter(finishedRowsCounter, conf.Labels)
+			finishedBytes := ReadGauge(finishedSizeGauge, conf.Labels)
+			finishedRows := ReadGauge(finishedRowsGauge, conf.Labels)
 			estimateTotalRows := ReadCounter(estimateTotalRowsCounter, conf.Labels)
 
 			tctx.L().Info("progress",
@@ -60,23 +59,3 @@ func calculateTableCount(m DatabaseTables) int {
 	}
 	return cnt
 }
-
-func (d *Dumper) getEstimateTotalRowsCount(tctx *tcontext.Context, conn *sql.Conn) error {
-	conf := d.conf
-	var totalCount uint64
-	for db, tables := range conf.Tables {
-		for _, m := range tables {
-			if m.Type == TableTypeBase {
-				// get pk or uk for explain
-				field, err := pickupPossibleField(db, m.Name, conn, conf)
-				if err != nil {
-					return err
-				}
-				c := estimateCount(tctx, db, m.Name, conn, field, conf)
-				totalCount += c
-			}
-		}
-	}
-	AddCounter(estimateTotalRowsCounter, conf.Labels, float64(totalCount))
-	return nil
-}
diff --git a/v4/export/util.go b/v4/export/util.go
index 6df177c..5f29119 100644
--- a/v4/export/util.go
+++ b/v4/export/util.go
@@ -66,3 +66,11 @@ func sameStringArray(a, b []string) bool {
 	}
 	return true
 }
+
+func string2Map(a, b []string) map[string]string {
+	a2b := make(map[string]string, len(a))
+	for i, str := range a {
+		a2b[str] = b[i]
+	}
+	return a2b
+}
diff --git a/v4/export/writer_util.go b/v4/export/writer_util.go
index 7a9f7f6..18bcc6e 100755
--- a/v4/export/writer_util.go
+++ b/v4/export/writer_util.go
@@ -76,7 +76,7 @@ func (b *writerPipe) Run(tctx *tcontext.Context) {
 			receiveChunkTime = time.Now()
 			err := writeBytes(tctx, b.w, s.Bytes())
 			ObserveHistogram(writeTimeHistogram, b.labels, time.Since(receiveChunkTime).Seconds())
-			AddCounter(finishedSizeCounter, b.labels, float64(s.Len()))
+			AddGauge(finishedSizeGauge, b.labels, float64(s.Len()))
 			b.finishedFileSize += uint64(s.Len())
 			s.Reset()
 			pool.Put(s)
@@ -175,11 +175,32 @@ func WriteInsert(pCtx *tcontext.Context, cfg *Config, meta TableMeta, tblIR Tabl
 		escapeBackslash       = cfg.EscapeBackslash
 	)
 
+	defer func() {
+		if err != nil {
+			pCtx.L().Warn("fail to dumping table(chunk), will revert some metrics now",
+				zap.Error(err),
+				zap.String("database", meta.DatabaseName()),
+				zap.String("table", meta.TableName()),
+				zap.Uint64("finished rows", lastCounter),
+				zap.Uint64("finished size", wp.finishedFileSize))
+			SubGauge(finishedRowsGauge, cfg.Labels, float64(lastCounter))
+			SubGauge(finishedSizeGauge, cfg.Labels, float64(wp.finishedFileSize))
+		} else {
+			pCtx.L().Debug("finish dumping table(chunk)",
+				zap.String("database", meta.DatabaseName()),
+				zap.String("table", meta.TableName()),
+				zap.Uint64("finished rows", counter),
+				zap.Uint64("finished size", wp.finishedFileSize))
+			summary.CollectSuccessUnit(summary.TotalBytes, 1, wp.finishedFileSize)
+			summary.CollectSuccessUnit("total rows", 1, counter)
+		}
+	}()
+
 	selectedField := meta.SelectedField()
 
 	// if has generated column
 	if selectedField != "" && selectedField != "*" {
-		insertStatementPrefix = fmt.Sprintf("INSERT INTO %s %s VALUES\n",
+		insertStatementPrefix = fmt.Sprintf("INSERT INTO %s (%s) VALUES\n",
 			wrapBackTicks(escapeString(meta.TableName())), selectedField)
 	} else {
 		insertStatementPrefix = fmt.Sprintf("INSERT INTO %s VALUES\n",
@@ -196,7 +217,6 @@ func WriteInsert(pCtx *tcontext.Context, cfg *Config, meta TableMeta, tblIR Tabl
 			lastBfSize := bf.Len()
 			if selectedField != "" {
 				if err = fileRowIter.Decode(row); err != nil {
-					pCtx.L().Error("fail to scan from sql.Row", zap.Error(err))
 					return counter, errors.Trace(err)
 				}
 				row.WriteToBuffer(bf, escapeBackslash)
@@ -227,7 +247,7 @@ func WriteInsert(pCtx *tcontext.Context, cfg *Config, meta TableMeta, tblIR Tabl
 					if bfCap := bf.Cap(); bfCap < lengthLimit {
 						bf.Grow(lengthLimit - bfCap)
 					}
-					AddCounter(finishedRowsCounter, cfg.Labels, float64(counter-lastCounter))
+					AddGauge(finishedRowsGauge, cfg.Labels, float64(counter-lastCounter))
 					lastCounter = counter
 				}
 			}
@@ -240,22 +260,13 @@ func WriteInsert(pCtx *tcontext.Context, cfg *Config, meta TableMeta, tblIR Tabl
 			break
 		}
 	}
-	pCtx.L().Debug("finish dumping table(chunk)",
-		zap.String("database", meta.DatabaseName()),
-		zap.String("table", meta.TableName()),
-		zap.Uint64("total rows", counter))
 	if bf.Len() > 0 {
 		wp.input <- bf
 	}
 	close(wp.input)
 	<-wp.closed
-	AddCounter(finishedRowsCounter, cfg.Labels, float64(counter-lastCounter))
-	defer func() {
-		if err == nil {
-			summary.CollectSuccessUnit(summary.TotalBytes, 1, wp.finishedFileSize)
-			summary.CollectSuccessUnit("total rows", 1, counter)
-		}
-	}()
+	AddGauge(finishedRowsGauge, cfg.Labels, float64(counter-lastCounter))
+	lastCounter = counter
 	if err = fileRowIter.Error(); err != nil {
 		return counter, errors.Trace(err)
 	}
@@ -302,6 +313,27 @@ func WriteInsertInCsv(pCtx *tcontext.Context, cfg *Config, meta TableMeta, tblIR
 		selectedFields  = meta.SelectedField()
 	)
 
+	defer func() {
+		if err != nil {
+			pCtx.L().Warn("fail to dumping table(chunk), will revert some metrics now",
+				zap.Error(err),
+				zap.String("database", meta.DatabaseName()),
+				zap.String("table", meta.TableName()),
+				zap.Uint64("finished rows", lastCounter),
+				zap.Uint64("finished size", wp.finishedFileSize))
+			SubGauge(finishedRowsGauge, cfg.Labels, float64(lastCounter))
+			SubGauge(finishedSizeGauge, cfg.Labels, float64(wp.finishedFileSize))
+		} else {
+			pCtx.L().Debug("finish dumping table(chunk)",
+				zap.String("database", meta.DatabaseName()),
+				zap.String("table", meta.TableName()),
+				zap.Uint64("finished rows", counter),
+				zap.Uint64("finished size", wp.finishedFileSize))
+			summary.CollectSuccessUnit(summary.TotalBytes, 1, wp.finishedFileSize)
+			summary.CollectSuccessUnit("total rows", 1, counter)
+		}
+	}()
+
 	if !cfg.NoHeader && len(meta.ColumnNames()) != 0 && selectedFields != "" {
 		for i, col := range meta.ColumnNames() {
 			bf.Write(opt.delimiter)
@@ -319,7 +351,6 @@ func WriteInsertInCsv(pCtx *tcontext.Context, cfg *Config, meta TableMeta, tblIR
 		lastBfSize := bf.Len()
 		if selectedFields != "" {
 			if err = fileRowIter.Decode(row); err != nil {
-				pCtx.L().Error("fail to scan from sql.Row", zap.Error(err))
 				return counter, errors.Trace(err)
 			}
 			row.WriteToBufferInCsv(bf, escapeBackslash, opt)
@@ -339,7 +370,7 @@ func WriteInsertInCsv(pCtx *tcontext.Context, cfg *Config, meta TableMeta, tblIR
 				if bfCap := bf.Cap(); bfCap < lengthLimit {
 					bf.Grow(lengthLimit - bfCap)
 				}
-				AddCounter(finishedRowsCounter, cfg.Labels, float64(counter-lastCounter))
+				AddGauge(finishedRowsGauge, cfg.Labels, float64(counter-lastCounter))
 				lastCounter = counter
 			}
 		}
@@ -350,22 +381,13 @@ func WriteInsertInCsv(pCtx *tcontext.Context, cfg *Config, meta TableMeta, tblIR
 		}
 	}
 
-	pCtx.L().Debug("finish dumping table(chunk)",
-		zap.String("database", meta.DatabaseName()),
-		zap.String("table", meta.TableName()),
-		zap.Uint64("total rows", counter))
 	if bf.Len() > 0 {
 		wp.input <- bf
 	}
 	close(wp.input)
 	<-wp.closed
-	defer func() {
-		if err == nil {
-			summary.CollectSuccessUnit(summary.TotalBytes, 1, wp.finishedFileSize)
-			summary.CollectSuccessUnit("total rows", 1, counter)
-		}
-	}()
-	AddCounter(finishedRowsCounter, cfg.Labels, float64(counter-lastCounter))
+	AddGauge(finishedRowsGauge, cfg.Labels, float64(counter-lastCounter))
+	lastCounter = counter
 	if err = fileRowIter.Error(); err != nil {
 		return counter, errors.Trace(err)
 	}


Test patch:
diff --git a/tests/run.sh b/tests/run.sh
index c0de699..407a1af 100755
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -4,8 +4,6 @@
 
 # To avoid permission denied error, please run `chmod +x tests/_utils/*`.
 
-set -e
-
 DUMPLING_TEST_DIR=${DUMPLING_TEST_DIR:-"/tmp/dumpling_test_result"}
 DUMPLING_TEST_USER=${DUMPLING_TEST_USER:-"root"}
 
diff --git a/tests/views/run.sh b/tests/views/run.sh
index f0d8d00..c9462e6 100644
--- a/tests/views/run.sh
+++ b/tests/views/run.sh
@@ -17,8 +17,18 @@ run_dumpling --no-views
 file_not_exist "$DUMPLING_OUTPUT_DIR/views.v-schema.sql"
 file_not_exist "$DUMPLING_OUTPUT_DIR/views.v-schema-view.sql"
 
+rm -rf $DUMPLING_OUTPUT_DIR
 run_dumpling --no-views=false
 #diff "$DUMPLING_BASE_NAME/data/views-schema-create.sql" "$DUMPLING_OUTPUT_DIR/views-schema-create.sql"
 diff "$DUMPLING_BASE_NAME/data/views.v-schema.sql" "$DUMPLING_OUTPUT_DIR/views.v-schema.sql"
 diff "$DUMPLING_BASE_NAME/data/views.v-schema-view.sql" "$DUMPLING_OUTPUT_DIR/views.v-schema-view.sql"
-file_not_exist "$DUMPLING_BASE_NAME/data/views.v.000000000.sql"
\ No newline at end of file
+file_not_exist "$DUMPLING_OUTPUT_DIR/views.v.000000000.sql"
+
+# test --no-schemas
+rm -rf $DUMPLING_OUTPUT_DIR
+run_dumpling --no-schemas
+file_not_exist "$DUMPLING_OUTPUT_DIR/views-schema-create.sql"
+file_not_exist "$DUMPLING_OUTPUT_DIR/views.t-schema.sql"
+file_not_exist "$DUMPLING_OUTPUT_DIR/views.v-schema.sql"
+file_not_exist "$DUMPLING_OUTPUT_DIR/views.v-schema-view.sql"
+file_not_exist "$DUMPLING_OUTPUT_DIR/views.v.000000000.sql"
diff --git a/v4/export/block_allow_list_test.go b/v4/export/block_allow_list_test.go
index b82a3c4..fddc771 100644
--- a/v4/export/block_allow_list_test.go
+++ b/v4/export/block_allow_list_test.go
@@ -20,11 +20,11 @@ func (s *testBWListSuite) TestFilterTables(c *C) {
 	dbTables := DatabaseTables{}
 	expectedDBTables := DatabaseTables{}
 
-	dbTables.AppendTables(filter.InformationSchemaName, []string{"xxx"}...)
-	dbTables.AppendTables(strings.ToUpper(filter.PerformanceSchemaName), []string{"xxx"}...)
-	dbTables.AppendTables("xxx", []string{"yyy"}...)
-	expectedDBTables.AppendTables("xxx", []string{"yyy"}...)
-	dbTables.AppendTables("yyy", []string{"xxx"}...)
+	dbTables.AppendTables(filter.InformationSchemaName, []string{"xxx"}, []uint64{0})
+	dbTables.AppendTables(strings.ToUpper(filter.PerformanceSchemaName), []string{"xxx"}, []uint64{0})
+	dbTables.AppendTables("xxx", []string{"yyy"}, []uint64{0})
+	expectedDBTables.AppendTables("xxx", []string{"yyy"}, []uint64{0})
+	dbTables.AppendTables("yyy", []string{"xxx"}, []uint64{0})
 
 	tableFilter, err := tf.Parse([]string{"*.*"})
 	c.Assert(err, IsNil)
diff --git a/v4/export/consistency_test.go b/v4/export/consistency_test.go
index 2f1b883..931dc49 100644
--- a/v4/export/consistency_test.go
+++ b/v4/export/consistency_test.go
@@ -65,7 +65,7 @@ func (s *testConsistencySuite) TestConsistencyController(c *C) {
 
 	conf.Consistency = consistencyTypeLock
 	conf.Tables = NewDatabaseTables().
-		AppendTables("db1", "t1", "t2", "t3").
+		AppendTables("db1", []string{"t1", "t2", "t3"}, []uint64{1, 2, 3}).
 		AppendViews("db2", "t4")
 	mock.ExpectExec("LOCK TABLES `db1`.`t1` READ,`db1`.`t2` READ,`db1`.`t3` READ").WillReturnResult(resultOk)
 	mock.ExpectExec("UNLOCK TABLES").WillReturnResult(resultOk)
@@ -73,9 +73,7 @@ func (s *testConsistencySuite) TestConsistencyController(c *C) {
 	_, ok = ctrl.(*ConsistencyLockDumpingTables)
 	c.Assert(ok, IsTrue)
 	s.assertLifetimeErrNil(tctx, ctrl, c)
-	if err = mock.ExpectationsWereMet(); err != nil {
-		c.Fatal(err.Error())
-	}
+	c.Assert(mock.ExpectationsWereMet(), IsNil)
 }
 
 func (s *testConsistencySuite) TestConsistencyLockControllerRetry(c *C) {
@@ -90,7 +88,7 @@ func (s *testConsistencySuite) TestConsistencyLockControllerRetry(c *C) {
 
 	conf.Consistency = consistencyTypeLock
 	conf.Tables = NewDatabaseTables().
-		AppendTables("db1", "t1", "t2", "t3").
+		AppendTables("db1", []string{"t1", "t2", "t3"}, []uint64{1, 2, 3}).
 		AppendViews("db2", "t4")
 	mock.ExpectExec("LOCK TABLES `db1`.`t1` READ,`db1`.`t2` READ,`db1`.`t3` READ").
 		WillReturnError(&mysql.MySQLError{Number: ErrNoSuchTable, Message: "Table 'db1.t3' doesn't exist"})
@@ -100,9 +98,12 @@ func (s *testConsistencySuite) TestConsistencyLockControllerRetry(c *C) {
 	_, ok := ctrl.(*ConsistencyLockDumpingTables)
 	c.Assert(ok, IsTrue)
 	s.assertLifetimeErrNil(tctx, ctrl, c)
-	if err = mock.ExpectationsWereMet(); err != nil {
-		c.Fatal(err.Error())
-	}
+	// should remove table db1.t3 in tables to dump
+	expectedDumpTables := NewDatabaseTables().
+		AppendTables("db1", []string{"t1", "t2"}, []uint64{1, 2}).
+		AppendViews("db2", "t4")
+	c.Assert(conf.Tables, DeepEquals, expectedDumpTables)
+	c.Assert(mock.ExpectationsWereMet(), IsNil)
 }
 
 func (s *testConsistencySuite) TestResolveAutoConsistency(c *C) {
@@ -156,7 +157,7 @@ func (s *testConsistencySuite) TestConsistencyControllerError(c *C) {
 
 	// lock table fail
 	conf.Consistency = consistencyTypeLock
-	conf.Tables = NewDatabaseTables().AppendTables("db", "t")
+	conf.Tables = NewDatabaseTables().AppendTables("db", []string{"t"}, []uint64{1})
 	mock.ExpectExec("LOCK TABLE").WillReturnError(errors.New(""))
 	ctrl, _ = NewConsistencyController(ctx, conf, db)
 	err = ctrl.Setup(tctx)
diff --git a/v4/export/dump_test.go b/v4/export/dump_test.go
index 64cccc2..edfc16c 100644
--- a/v4/export/dump_test.go
+++ b/v4/export/dump_test.go
@@ -53,3 +53,39 @@ func (s *testSQLSuite) TestDumpBlock(c *C) {
 	c.Assert(errors.ErrorEqual(d.dumpDatabases(writerCtx, conn, taskChan), context.Canceled), IsTrue)
 	c.Assert(errors.ErrorEqual(wg.Wait(), writerErr), IsTrue)
 }
+
+func (s *testSQLSuite) TestDumpTableMeta(c *C) {
+	db, mock, err := sqlmock.New()
+	c.Assert(err, IsNil)
+	defer db.Close()
+
+	tctx, cancel := tcontext.Background().WithLogger(appLogger).WithCancel()
+	defer cancel()
+	conn, err := db.Conn(tctx)
+	c.Assert(err, IsNil)
+	conf := DefaultConfig()
+	conf.NoSchemas = true
+
+	for serverType := ServerTypeUnknown; serverType < ServerTypeAll; serverType++ {
+		conf.ServerInfo.ServerType = ServerType(serverType)
+		hasImplicitRowID := false
+		mock.ExpectQuery("SHOW COLUMNS FROM").
+			WillReturnRows(sqlmock.NewRows([]string{"Field", "Type", "Null", "Key", "Default", "Extra"}).
+				AddRow("id", "int(11)", "NO", "PRI", nil, ""))
+		if serverType == ServerTypeTiDB {
+			mock.ExpectExec("SELECT _tidb_rowid from").
+				WillReturnResult(sqlmock.NewResult(0, 0))
+			hasImplicitRowID = true
+		}
+		mock.ExpectQuery(fmt.Sprintf("SELECT \\* FROM `%s`.`%s`", database, table)).
+			WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow(1))
+		meta, err := dumpTableMeta(conf, conn, database, &TableInfo{Type: TableTypeBase, Name: table})
+		c.Assert(err, IsNil)
+		c.Assert(meta.DatabaseName(), Equals, database)
+		c.Assert(meta.TableName(), Equals, table)
+		c.Assert(meta.SelectedField(), Equals, "*")
+		c.Assert(meta.SelectedLen(), Equals, 1)
+		c.Assert(meta.ShowCreateTable(), Equals, "")
+		c.Assert(meta.HasImplicitRowID(), Equals, hasImplicitRowID)
+	}
+}
diff --git a/v4/export/prepare_test.go b/v4/export/prepare_test.go
index 2883254..acf0691 100644
--- a/v4/export/prepare_test.go
+++ b/v4/export/prepare_test.go
@@ -6,6 +6,8 @@ import (
 	"context"
 	"fmt"
 
+	tcontext "github.com/pingcap/dumpling/v4/context"
+
 	"github.com/DATA-DOG/go-sqlmock"
 	. "github.com/pingcap/check"
 )
@@ -64,14 +66,16 @@ func (s *testPrepareSuite) TestListAllTables(c *C) {
 	defer db.Close()
 	conn, err := db.Conn(context.Background())
 	c.Assert(err, IsNil)
+	tctx := tcontext.Background().WithLogger(appLogger)
 
+	// Test list all tables and skipping views.
 	data := NewDatabaseTables().
-		AppendTables("db1", "t1", "t2").
-		AppendTables("db2", "t3", "t4", "t5").
+		AppendTables("db1", []string{"t1", "t2"}, []uint64{1, 2}).
+		AppendTables("db2", []string{"t3", "t4", "t5"}, []uint64{3, 4, 5}).
 		AppendViews("db3", "t6", "t7", "t8")
 
 	dbNames := make([]databaseName, 0, len(data))
-	rows := sqlmock.NewRows([]string{"table_schema", "table_name"})
+	rows := sqlmock.NewRows([]string{"TABLE_SCHEMA", "TABLE_NAME", "TABLE_TYPE", "AVG_ROW_LENGTH"})
 	for dbName, tableInfos := range data {
 		dbNames = append(dbNames, dbName)
 
@@ -79,13 +83,13 @@ func (s *testPrepareSuite) TestListAllTables(c *C) {
 			if tbInfo.Type == TableTypeView {
 				continue
 			}
-			rows.AddRow(dbName, tbInfo.Name)
+			rows.AddRow(dbName, tbInfo.Name, tbInfo.Type.String(), tbInfo.AvgRowLength)
 		}
 	}
-	query := "SELECT table_schema,table_name FROM information_schema.tables WHERE table_type = (.*)"
+	query := "SELECT TABLE_SCHEMA,TABLE_NAME,TABLE_TYPE,AVG_ROW_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE'"
 	mock.ExpectQuery(query).WillReturnRows(rows)
 
-	tables, err := listAllTables(conn, dbNames)
+	tables, err := ListAllDatabasesTables(tctx, conn, dbNames, true, TableTypeBase)
 	c.Assert(err, IsNil)
 
 	for d, t := range tables {
@@ -99,15 +103,81 @@ func (s *testPrepareSuite) TestListAllTables(c *C) {
 
 	// Test list all tables and not skipping views.
 	data = NewDatabaseTables().
-		AppendTables("db", "t1").
+		AppendTables("db", []string{"t1"}, []uint64{1}).
 		AppendViews("db", "t2")
-	query = "SELECT table_schema,table_name FROM information_schema.tables WHERE table_type = (.*)"
-	mock.ExpectQuery(query).WillReturnRows(sqlmock.NewRows([]string{"table_schema", "table_name"}).AddRow("db", "t2"))
-	tables, err = listAllViews(conn, []string{"db"})
+	query = "SELECT TABLE_SCHEMA,TABLE_NAME,TABLE_TYPE,AVG_ROW_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE' OR TABLE_TYPE='VIEW'"
+	mock.ExpectQuery(query).WillReturnRows(sqlmock.NewRows([]string{"TABLE_SCHEMA", "TABLE_NAME", "TABLE_TYPE", "AVG_ROW_LENGTH"}).
+		AddRow("db", "t1", TableTypeBaseStr, 1).AddRow("db", "t2", TableTypeViewStr, nil))
+	tables, err = ListAllDatabasesTables(tctx, conn, []string{"db"}, true, TableTypeBase, TableTypeView)
 	c.Assert(err, IsNil)
 	c.Assert(len(tables), Equals, 1)
-	c.Assert(len(tables["db"]), Equals, 1)
-	c.Assert(tables["db"][0].Equals(data["db"][1]), IsTrue, Commentf("%v mismatch %v", tables["db"][0], data["db"][1]))
+	c.Assert(len(tables["db"]), Equals, 2)
+	for i := 0; i < len(tables["db"]); i++ {
+		cmt := Commentf("%v mismatch: %v", tables["db"][i], data["db"][i])
+		c.Assert(tables["db"][i].Equals(data["db"][i]), IsTrue, cmt)
+	}
+
+	c.Assert(mock.ExpectationsWereMet(), IsNil)
+}
+
+func (s *testPrepareSuite) TestListAllTablesByTableStatus(c *C) {
+	db, mock, err := sqlmock.New()
+	c.Assert(err, IsNil)
+	defer db.Close()
+	conn, err := db.Conn(context.Background())
+	c.Assert(err, IsNil)
+	tctx := tcontext.Background().WithLogger(appLogger)
+
+	// Test list all tables and skipping views.
+	data := NewDatabaseTables().
+		AppendTables("db1", []string{"t1", "t2"}, []uint64{1, 2}).
+		AppendTables("db2", []string{"t3", "t4", "t5"}, []uint64{3, 4, 5}).
+		AppendViews("db3", "t6", "t7", "t8")
+
+	query := "SHOW TABLE STATUS FROM `%s`"
+	showTableStatusColumnNames := []string{"Name", "Engine", "Version", "Row_format", "Rows", "Avg_row_length", "Data_length", "Max_data_length", "Index_length", "Data_free", "Auto_increment", "Create_time", "Update_time", "Check_time", "Collation", "Checksum", "Create_options", "Comment"}
+	dbNames := make([]databaseName, 0, len(data))
+	for dbName, tableInfos := range data {
+		dbNames = append(dbNames, dbName)
+		rows := sqlmock.NewRows(showTableStatusColumnNames)
+
+		for _, tbInfo := range tableInfos {
+			if tbInfo.Type == TableTypeBase {
+				rows.AddRow(tbInfo.Name, "InnoDB", 10, "Dynamic", 0, 0, 16384, 0, 0, 0, nil, "2021-07-08 03:04:07", nil, nil, "latin1_swedish_ci", nil, "", "")
+			} else {
+				rows.AddRow(tbInfo.Name, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, "VIEW")
+			}
+		}
+		mock.ExpectQuery(fmt.Sprintf(query, dbName)).WillReturnRows(rows)
+	}
+
+	tables, err := ListAllDatabasesTables(tctx, conn, dbNames, false, TableTypeBase)
+	c.Assert(err, IsNil)
+
+	for d, t := range tables {
+		expectedTbs, ok := data[d]
+		c.Assert(ok, IsTrue)
+		for i := 0; i < len(t); i++ {
+			cmt := Commentf("%v mismatch: %v", t[i], expectedTbs[i])
+			c.Assert(t[i].Equals(expectedTbs[i]), IsTrue, cmt)
+		}
+	}
+
+	// Test list all tables and not skipping views.
+	data = NewDatabaseTables().
+		AppendTables("db", []string{"t1"}, []uint64{1}).
+		AppendViews("db", "t2")
+	mock.ExpectQuery(fmt.Sprintf(query, "db")).WillReturnRows(sqlmock.NewRows(showTableStatusColumnNames).
+		AddRow("t1", "InnoDB", 10, "Dynamic", 0, 1, 16384, 0, 0, 0, nil, "2021-07-08 03:04:07", nil, nil, "latin1_swedish_ci", nil, "", "").
+		AddRow("t2", nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, "VIEW"))
+	tables, err = ListAllDatabasesTables(tctx, conn, []string{"db"}, false, TableTypeBase, TableTypeView)
+	c.Assert(err, IsNil)
+	c.Assert(len(tables), Equals, 1)
+	c.Assert(len(tables["db"]), Equals, 2)
+	for i := 0; i < len(tables["db"]); i++ {
+		cmt := Commentf("%v mismatch: %v", tables["db"][i], data["db"][i])
+		c.Assert(tables["db"][i].Equals(data["db"][i]), IsTrue, cmt)
+	}
 
 	c.Assert(mock.ExpectationsWereMet(), IsNil)
 }
diff --git a/v4/export/sql_test.go b/v4/export/sql_test.go
index 7d8c94a..4b6a0f4 100644
--- a/v4/export/sql_test.go
+++ b/v4/export/sql_test.go
@@ -4,9 +4,7 @@ package export
 
 import (
 	"context"
-	"database/sql"
 	"database/sql/driver"
-	"errors"
 	"fmt"
 	"strings"
 
@@ -15,10 +13,18 @@ import (
 	"github.com/DATA-DOG/go-sqlmock"
 	"github.com/coreos/go-semver/semver"
 	. "github.com/pingcap/check"
-	"github.com/siddontang/go-mysql/mysql"
+	"github.com/pingcap/errors"
 )
 
-var _ = Suite(&testSQLSuite{})
+var (
+	_                = Suite(&testSQLSuite{})
+	showIndexHeaders = []string{"Table", "Non_unique", "Key_name", "Seq_in_index", "Column_name", "Collation", "Cardinality", "Sub_part", "Packed", "Null", "Index_type", "Comment", "Index_comment"}
+)
+
+const (
+	database = "foo"
+	table    = "bar"
+)
 
 type testSQLSuite struct{}
 
@@ -74,41 +80,33 @@ func (s *testSQLSuite) TestBuildSelectAllQuery(c *C) {
 	// Test TiDB server.
 	mockConf.ServerInfo.ServerType = ServerTypeTiDB
 
-	// _tidb_rowid is available.
-	mock.ExpectExec("SELECT _tidb_rowid from `test`.`t`").
-		WillReturnResult(sqlmock.NewResult(0, 0))
-
-	orderByClause, err := buildOrderByClause(mockConf, conn, "test", "t")
+	orderByClause, err := buildOrderByClause(mockConf, conn, database, table, true)
 	c.Assert(err, IsNil)
 
-	mock.ExpectQuery("SELECT COLUMN_NAME").
-		WithArgs(sqlmock.AnyArg(), sqlmock.AnyArg()).
-		WillReturnRows(sqlmock.NewRows([]string{"column_name", "extra"}).AddRow("id", ""))
+	mock.ExpectQuery("SHOW COLUMNS FROM").
+		WillReturnRows(sqlmock.NewRows([]string{"Field", "Type", "Null", "Key", "Default", "Extra"}).
+			AddRow("id", "int(11)", "NO", "PRI", nil, ""))
 
-	selectedField, _, err := buildSelectField(conn, "test", "t", false)
+	selectedField, _, err := buildSelectField(conn, database, table, false)
 	c.Assert(err, IsNil)
-	q := buildSelectQuery("test", "t", selectedField, "", "", orderByClause)
-	c.Assert(q, Equals, "SELECT * FROM `test`.`t` ORDER BY `_tidb_rowid`")
+	q := buildSelectQuery(database, table, selectedField, "", "", orderByClause)
+	c.Assert(q, Equals, fmt.Sprintf("SELECT * FROM `%s`.`%s` ORDER BY `_tidb_rowid`", database, table))
 
-	// _tidb_rowid is unavailable, or PKIsHandle.
-	mock.ExpectExec("SELECT _tidb_rowid from `test`.`t`").
-		WillReturnError(errors.New(`1054, "Unknown column '_tidb_rowid' in 'field list'"`))
-
-	mock.ExpectQuery("SELECT column_name FROM information_schema.KEY_COLUMN_USAGE").
-		WithArgs("test", "t").
-		WillReturnRows(sqlmock.NewRows([]string{"column_name"}).AddRow("id"))
+	mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).
+		WillReturnRows(sqlmock.NewRows(showIndexHeaders).
+			AddRow(table, 0, "PRIMARY", 1, "id", "A", 0, nil, nil, "", "BTREE", "", ""))
 
-	orderByClause, err = buildOrderByClause(mockConf, conn, "test", "t")
+	orderByClause, err = buildOrderByClause(mockConf, conn, database, table, false)
 	c.Assert(err, IsNil)
 
-	mock.ExpectQuery("SELECT COLUMN_NAME").
-		WithArgs(sqlmock.AnyArg(), sqlmock.AnyArg()).
-		WillReturnRows(sqlmock.NewRows([]string{"column_name", "extra"}).AddRow("id", ""))
+	mock.ExpectQuery("SHOW COLUMNS FROM").
+		WillReturnRows(sqlmock.NewRows([]string{"Field", "Type", "Null", "Key", "Default", "Extra"}).
+			AddRow("id", "int(11)", "NO", "PRI", nil, ""))
 
-	selectedField, _, err = buildSelectField(conn, "test", "t", false)
+	selectedField, _, err = buildSelectField(conn, database, table, false)
 	c.Assert(err, IsNil)
-	q = buildSelectQuery("test", "t", selectedField, "", "", orderByClause)
-	c.Assert(q, Equals, "SELECT * FROM `test`.`t` ORDER BY `id`")
+	q = buildSelectQuery(database, table, selectedField, "", "", orderByClause)
+	c.Assert(q, Equals, fmt.Sprintf("SELECT * FROM `%s`.`%s` ORDER BY `id`", database, table))
 	c.Assert(mock.ExpectationsWereMet(), IsNil)
 
 	// Test other servers.
@@ -118,20 +116,20 @@ func (s *testSQLSuite) TestBuildSelectAllQuery(c *C) {
 	for _, serverTp := range otherServers {
 		mockConf.ServerInfo.ServerType = serverTp
 		cmt := Commentf("server type: %s", serverTp)
-		mock.ExpectQuery("SELECT column_name FROM information_schema.KEY_COLUMN_USAGE").
-			WithArgs("test", "t").
-			WillReturnRows(sqlmock.NewRows([]string{"column_name"}).AddRow("id"))
-		orderByClause, err := buildOrderByClause(mockConf, conn, "test", "t")
+		mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).
+			WillReturnRows(sqlmock.NewRows(showIndexHeaders).
+				AddRow(table, 0, "PRIMARY", 1, "id", "A", 0, nil, nil, "", "BTREE", "", ""))
+		orderByClause, err := buildOrderByClause(mockConf, conn, database, table, false)
 		c.Assert(err, IsNil, cmt)
 
-		mock.ExpectQuery("SELECT COLUMN_NAME").
-			WithArgs(sqlmock.AnyArg(), sqlmock.AnyArg()).
-			WillReturnRows(sqlmock.NewRows([]string{"column_name", "extra"}).AddRow("id", ""))
+		mock.ExpectQuery("SHOW COLUMNS FROM").
+			WillReturnRows(sqlmock.NewRows([]string{"Field", "Type", "Null", "Key", "Default", "Extra"}).
+				AddRow("id", "int(11)", "NO", "PRI", nil, ""))
 
-		selectedField, _, err = buildSelectField(conn, "test", "t", false)
+		selectedField, _, err = buildSelectField(conn, database, table, false)
 		c.Assert(err, IsNil)
-		q = buildSelectQuery("test", "t", selectedField, "", "", orderByClause)
-		c.Assert(q, Equals, "SELECT * FROM `test`.`t` ORDER BY `id`", cmt)
+		q = buildSelectQuery(database, table, selectedField, "", "", orderByClause)
+		c.Assert(q, Equals, fmt.Sprintf("SELECT * FROM `%s`.`%s` ORDER BY `id`", database, table), cmt)
 		err = mock.ExpectationsWereMet()
 		c.Assert(err, IsNil, cmt)
 		c.Assert(mock.ExpectationsWereMet(), IsNil, cmt)
@@ -141,21 +139,20 @@ func (s *testSQLSuite) TestBuildSelectAllQuery(c *C) {
 	for _, serverTp := range otherServers {
 		mockConf.ServerInfo.ServerType = serverTp
 		cmt := Commentf("server type: %s", serverTp)
-		mock.ExpectQuery("SELECT column_name FROM information_schema.KEY_COLUMN_USAGE").
-			WithArgs("test", "t").
-			WillReturnRows(sqlmock.NewRows([]string{"column_name"}))
+		mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).
+			WillReturnRows(sqlmock.NewRows(showIndexHeaders))
 
-		orderByClause, err := buildOrderByClause(mockConf, conn, "test", "t")
+		orderByClause, err := buildOrderByClause(mockConf, conn, database, table, false)
 		c.Assert(err, IsNil, cmt)
 
-		mock.ExpectQuery("SELECT COLUMN_NAME").
-			WithArgs(sqlmock.AnyArg(), sqlmock.AnyArg()).
-			WillReturnRows(sqlmock.NewRows([]string{"column_name", "extra"}).AddRow("id", ""))
+		mock.ExpectQuery("SHOW COLUMNS FROM").
+			WillReturnRows(sqlmock.NewRows([]string{"Field", "Type", "Null", "Key", "Default", "Extra"}).
+				AddRow("id", "int(11)", "NO", "PRI", nil, ""))
 
 		selectedField, _, err = buildSelectField(conn, "test", "t", false)
 		c.Assert(err, IsNil)
-		q := buildSelectQuery("test", "t", selectedField, "", "", orderByClause)
-		c.Assert(q, Equals, "SELECT * FROM `test`.`t`", cmt)
+		q := buildSelectQuery(database, table, selectedField, "", "", orderByClause)
+		c.Assert(q, Equals, fmt.Sprintf("SELECT * FROM `%s`.`%s`", database, table), cmt)
 		err = mock.ExpectationsWereMet()
 		c.Assert(err, IsNil, cmt)
 		c.Assert(mock.ExpectationsWereMet(), IsNil)
@@ -167,14 +164,14 @@ func (s *testSQLSuite) TestBuildSelectAllQuery(c *C) {
 		mockConf.ServerInfo.ServerType = ServerType(tp)
 		cmt := Commentf("current server type: ", tp)
 
-		mock.ExpectQuery("SELECT COLUMN_NAME").
-			WithArgs(sqlmock.AnyArg(), sqlmock.AnyArg()).
-			WillReturnRows(sqlmock.NewRows([]string{"column_name", "extra"}).AddRow("id", ""))
+		mock.ExpectQuery("SHOW COLUMNS FROM").
+			WillReturnRows(sqlmock.NewRows([]string{"Field", "Type", "Null", "Key", "Default", "Extra"}).
+				AddRow("id", "int(11)", "NO", "PRI", nil, ""))
 
 		selectedField, _, err := buildSelectField(conn, "test", "t", false)
 		c.Assert(err, IsNil)
-		q := buildSelectQuery("test", "t", selectedField, "", "", "")
-		c.Assert(q, Equals, "SELECT * FROM `test`.`t`", cmt)
+		q := buildSelectQuery(database, table, selectedField, "", "", "")
+		c.Assert(q, Equals, fmt.Sprintf("SELECT * FROM `%s`.`%s`", database, table), cmt)
 		c.Assert(mock.ExpectationsWereMet(), IsNil, cmt)
 	}
 }
@@ -192,73 +189,47 @@ func (s *testSQLSuite) TestBuildOrderByClause(c *C) {
 	// Test TiDB server.
 	mockConf.ServerInfo.ServerType = ServerTypeTiDB
 
-	// _tidb_rowid is available.
-	mock.ExpectExec("SELECT _tidb_rowid from `test`.`t`").
-		WillReturnResult(sqlmock.NewResult(0, 0))
-
-	orderByClause, err := buildOrderByClause(mockConf, conn, "test", "t")
+	orderByClause, err := buildOrderByClause(mockConf, conn, database, table, true)
 	c.Assert(err, IsNil)
 	c.Assert(orderByClause, Equals, orderByTiDBRowID)
 
-	// _tidb_rowid is unavailable, or PKIsHandle.
-	mock.ExpectExec("SELECT _tidb_rowid from `test`.`t`").
-		WillReturnError(errors.New(`1054, "Unknown column '_tidb_rowid' in 'field list'"`))
-
-	mock.ExpectQuery("SELECT column_name FROM information_schema.KEY_COLUMN_USAGE").
-		WithArgs("test", "t").
-		WillReturnRows(sqlmock.NewRows([]string{"column_name"}).AddRow("id"))
+	mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).
+		WillReturnRows(sqlmock.NewRows(showIndexHeaders).AddRow(table, 0, "PRIMARY", 1, "id", "A", 0, nil, nil, "", "BTREE", "", ""))
 
-	orderByClause, err = buildOrderByClause(mockConf, conn, "test", "t")
+	orderByClause, err = buildOrderByClause(mockConf, conn, database, table, false)
 	c.Assert(err, IsNil)
 	c.Assert(orderByClause, Equals, "ORDER BY `id`")
 
-	// Test other servers.
-	otherServers := []ServerType{ServerTypeUnknown, ServerTypeMySQL, ServerTypeMariaDB}
-
 	// Test table with primary key.
-	for _, serverTp := range otherServers {
-		mockConf.ServerInfo.ServerType = serverTp
-		cmt := Commentf("server type: %s", serverTp)
-		mock.ExpectQuery("SELECT column_name FROM information_schema.KEY_COLUMN_USAGE").
-			WithArgs("test", "t").
-			WillReturnRows(sqlmock.NewRows([]string{"column_name"}).AddRow("id"))
-		orderByClause, err := buildOrderByClause(mockConf, conn, "test", "t")
-		c.Assert(err, IsNil, cmt)
-		c.Assert(orderByClause, Equals, "ORDER BY `id`", cmt)
-	}
+	mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).
+		WillReturnRows(sqlmock.NewRows(showIndexHeaders).AddRow(table, 0, "PRIMARY", 1, "id", "A", 0, nil, nil, "", "BTREE", "", ""))
+	orderByClause, err = buildOrderByClause(mockConf, conn, database, table, false)
+	c.Assert(err, IsNil)
+	c.Assert(orderByClause, Equals, "ORDER BY `id`")
 
 	// Test table with joint primary key.
-	for _, serverTp := range otherServers {
-		mockConf.ServerInfo.ServerType = serverTp
-		cmt := Commentf("server type: %s", serverTp)
-		mock.ExpectQuery("SELECT column_name FROM information_schema.KEY_COLUMN_USAGE").
-			WithArgs("test", "t").
-			WillReturnRows(sqlmock.NewRows([]string{"column_name"}).AddRow("id").AddRow("name"))
-		orderByClause, err := buildOrderByClause(mockConf, conn, "test", "t")
-		c.Assert(err, IsNil, cmt)
-		c.Assert(orderByClause, Equals, "ORDER BY `id`,`name`", cmt)
-	}
+	mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).
+		WillReturnRows(sqlmock.NewRows(showIndexHeaders).
+			AddRow(table, 0, "PRIMARY", 1, "id", "A", 0, nil, nil, "", "BTREE", "", "").
+			AddRow(table, 0, "PRIMARY", 2, "name", "A", 0, nil, nil, "", "BTREE", "", ""))
+	orderByClause, err = buildOrderByClause(mockConf, conn, database, table, false)
+	c.Assert(err, IsNil)
+	c.Assert(orderByClause, Equals, "ORDER BY `id`,`name`")
 
 	// Test table without primary key.
-	for _, serverTp := range otherServers {
-		mockConf.ServerInfo.ServerType = serverTp
-		cmt := Commentf("server type: %s", serverTp)
-		mock.ExpectQuery("SELECT column_name FROM information_schema.KEY_COLUMN_USAGE").
-			WithArgs("test", "t").
-			WillReturnRows(sqlmock.NewRows([]string{"column_name"}))
+	mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).
+		WillReturnRows(sqlmock.NewRows(showIndexHeaders))
 
-		orderByClause, err := buildOrderByClause(mockConf, conn, "test", "t")
-		c.Assert(err, IsNil, cmt)
-		c.Assert(orderByClause, Equals, "", cmt)
-	}
+	orderByClause, err = buildOrderByClause(mockConf, conn, database, table, false)
+	c.Assert(err, IsNil)
+	c.Assert(orderByClause, Equals, "")
 
 	// Test when config.SortByPk is disabled.
 	mockConf.SortByPk = false
-	for tp := ServerTypeUnknown; tp < ServerTypeAll; tp++ {
-		mockConf.ServerInfo.ServerType = ServerType(tp)
-		cmt := Commentf("current server type: ", tp)
+	for _, hasImplicitRowID := range []bool{false, true} {
+		cmt := Commentf("current hasImplicitRowID: ", hasImplicitRowID)
 
-		orderByClause, err := buildOrderByClause(mockConf, conn, "test", "t")
+		orderByClause, err := buildOrderByClause(mockConf, conn, database, table, hasImplicitRowID)
 		c.Assert(err, IsNil, cmt)
 		c.Assert(orderByClause, Equals, "", cmt)
 	}
@@ -272,9 +243,9 @@ func (s *testSQLSuite) TestBuildSelectField(c *C) {
 	c.Assert(err, IsNil)
 
 	// generate columns not found
-	mock.ExpectQuery("SELECT COLUMN_NAME").
-		WithArgs(sqlmock.AnyArg(), sqlmock.AnyArg()).
-		WillReturnRows(sqlmock.NewRows([]string{"column_name", "extra"}).AddRow("id", ""))
+	mock.ExpectQuery("SHOW COLUMNS FROM").
+		WillReturnRows(sqlmock.NewRows([]string{"Field", "Type", "Null", "Key", "Default", "Extra"}).
+			AddRow("id", "int(11)", "NO", "PRI", nil, ""))
 
 	selectedField, _, err := buildSelectField(conn, "test", "t", false)
 	c.Assert(selectedField, Equals, "*")
@@ -282,10 +253,11 @@ func (s *testSQLSuite) TestBuildSelectField(c *C) {
 	c.Assert(mock.ExpectationsWereMet(), IsNil)
 
 	// user assigns completeInsert
-	mock.ExpectQuery("SELECT COLUMN_NAME").
-		WithArgs(sqlmock.AnyArg(), sqlmock.AnyArg()).
-		WillReturnRows(sqlmock.NewRows([]string{"column_name", "extra"}).AddRow("id", "").
-			AddRow("name", "").AddRow("quo`te", ""))
+	mock.ExpectQuery("SHOW COLUMNS FROM").
+		WillReturnRows(sqlmock.NewRows([]string{"Field", "Type", "Null", "Key", "Default", "Extra"}).
+			AddRow("id", "int(11)", "NO", "PRI", nil, "").
+			AddRow("name", "varchar(12)", "NO", "", nil, "").
+			AddRow("quo`te", "varchar(12)", "NO", "UNI", nil, ""))
 
 	selectedField, _, err = buildSelectField(conn, "test", "t", true)
 	c.Assert(selectedField, Equals, "`id`,`name`,`quo``te`")
@@ -293,10 +265,12 @@ func (s *testSQLSuite) TestBuildSelectField(c *C) {
 	c.Assert(mock.ExpectationsWereMet(), IsNil)
 
 	// found generate columns, rest columns is `id`,`name`
-	mock.ExpectQuery("SELECT COLUMN_NAME").
-		WithArgs(sqlmock.AnyArg(), sqlmock.AnyArg()).
-		WillReturnRows(sqlmock.NewRows([]string{"column_name", "extra"}).
-			AddRow("id", "").AddRow("name", "").AddRow("quo`te", "").AddRow("generated", "VIRTUAL GENERATED"))
+	mock.ExpectQuery("SHOW COLUMNS FROM").
+		WillReturnRows(sqlmock.NewRows([]string{"Field", "Type", "Null", "Key", "Default", "Extra"}).
+			AddRow("id", "int(11)", "NO", "PRI", nil, "").
+			AddRow("name", "varchar(12)", "NO", "", nil, "").
+			AddRow("quo`te", "varchar(12)", "NO", "UNI", nil, "").
+			AddRow("generated", "varchar(12)", "NO", "", nil, "VIRTUAL GENERATED"))
 
 	selectedField, _, err = buildSelectField(conn, "test", "t", false)
 	c.Assert(selectedField, Equals, "`id`,`name`,`quo``te`")
@@ -353,64 +327,64 @@ func (s *testSQLSuite) TestShowCreateView(c *C) {
 }
 
 func (s *testSQLSuite) TestGetSuitableRows(c *C) {
-	db, mock, err := sqlmock.New()
-	c.Assert(err, IsNil)
-	defer db.Close()
-	conn, err := db.Conn(context.Background())
-	c.Assert(err, IsNil)
-	tctx, cancel := tcontext.Background().WithCancel()
-	defer cancel()
-	const (
-		query    = "select AVG_ROW_LENGTH from INFORMATION_SCHEMA.TABLES where table_schema=\\? and table_name=\\?;"
-		database = "foo"
-		table    = "bar"
-	)
-
 	testCases := []struct {
 		avgRowLength uint64
 		expectedRows uint64
-		returnErr    error
 	}{
-		{
-			32,
-			200000,
-			sql.ErrNoRows,
-		},
 		{
 			0,
 			200000,
-			nil,
 		},
 		{
 			32,
 			1000000,
-			nil,
 		},
 		{
 			1024,
 			131072,
-			nil,
 		},
 		{
 			4096,
 			32768,
-			nil,
 		},
 	}
 	for _, testCase := range testCases {
-		if testCase.returnErr == nil {
-			mock.ExpectQuery(query).WithArgs(database, table).
-				WillReturnRows(sqlmock.NewRows([]string{"AVG_ROW_LENGTH"}).
-					AddRow(testCase.avgRowLength))
-		} else {
-			mock.ExpectQuery(query).WithArgs(database, table).
-				WillReturnError(testCase.returnErr)
-		}
-		rows := GetSuitableRows(tctx, conn, database, table)
+		rows := GetSuitableRows(testCase.avgRowLength)
 		c.Assert(rows, Equals, testCase.expectedRows)
 	}
 }
 
+func (s *testSQLSuite) TestSelectTiDBRowID(c *C) {
+	db, mock, err := sqlmock.New()
+	c.Assert(err, IsNil)
+	defer db.Close()
+	conn, err := db.Conn(context.Background())
+	c.Assert(err, IsNil)
+	database, table := "test", "t"
+
+	// _tidb_rowid is unavailable, or PKIsHandle.
+	mock.ExpectExec("SELECT _tidb_rowid from `test`.`t`").
+		WillReturnError(errors.New(`1054, "Unknown column '_tidb_rowid' in 'field list'"`))
+	hasImplicitRowID, err := SelectTiDBRowID(conn, database, table)
+	c.Assert(err, IsNil)
+	c.Assert(hasImplicitRowID, IsFalse)
+
+	// _tidb_rowid is available.
+	mock.ExpectExec("SELECT _tidb_rowid from `test`.`t`").
+		WillReturnResult(sqlmock.NewResult(0, 0))
+	hasImplicitRowID, err = SelectTiDBRowID(conn, database, table)
+	c.Assert(err, IsNil)
+	c.Assert(hasImplicitRowID, IsTrue)
+
+	// _tidb_rowid returns error
+	expectedErr := errors.New("mock error")
+	mock.ExpectExec("SELECT _tidb_rowid from `test`.`t`").
+		WillReturnError(expectedErr)
+	hasImplicitRowID, err = SelectTiDBRowID(conn, database, table)
+	c.Assert(errors.Cause(err), Equals, expectedErr)
+	c.Assert(hasImplicitRowID, IsFalse)
+}
+
 func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 	db, mock, err := sqlmock.New()
 	c.Assert(err, IsNil)
@@ -430,11 +404,6 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		ServerVersion: tableSampleVersion,
 	}
 
-	const (
-		database = "foo"
-		table    = "bar"
-	)
-
 	testCases := []struct {
 		handleColNames       []string
 		handleColTypes       []string
@@ -451,7 +420,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		},
 		{
 			[]string{"a"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[][]driver.Value{{1}},
 			[]string{"`a`<1", "`a`>=1"},
 			false,
@@ -459,7 +428,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		// check whether dumpling can turn to dump whole table
 		{
 			[]string{"a"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[][]driver.Value{},
 			nil,
 			false,
@@ -467,21 +436,21 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		// check whether dumpling can turn to dump whole table
 		{
 			[]string{"_tidb_rowid"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[][]driver.Value{},
 			nil,
 			true,
 		},
 		{
 			[]string{"_tidb_rowid"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[][]driver.Value{{1}},
 			[]string{"`_tidb_rowid`<1", "`_tidb_rowid`>=1"},
 			true,
 		},
 		{
 			[]string{"a"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[][]driver.Value{
 				{1},
 				{2},
@@ -492,14 +461,14 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		},
 		{
 			[]string{"a", "b"},
-			[]string{"bigint", "bigint"},
+			[]string{"BIGINT", "BIGINT"},
 			[][]driver.Value{{1, 2}},
 			[]string{"`a`<1 or(`a`=1 and `b`<2)", "`a`>1 or(`a`=1 and `b`>=2)"},
 			false,
 		},
 		{
 			[]string{"a", "b"},
-			[]string{"bigint", "bigint"},
+			[]string{"BIGINT", "BIGINT"},
 			[][]driver.Value{
 				{1, 2},
 				{3, 4},
@@ -515,7 +484,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		},
 		{
 			[]string{"a", "b", "c"},
-			[]string{"bigint", "bigint", "bigint"},
+			[]string{"BIGINT", "BIGINT", "BIGINT"},
 			[][]driver.Value{
 				{1, 2, 3},
 				{4, 5, 6},
@@ -529,7 +498,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		},
 		{
 			[]string{"a", "b", "c"},
-			[]string{"bigint", "bigint", "bigint"},
+			[]string{"BIGINT", "BIGINT", "BIGINT"},
 			[][]driver.Value{
 				{1, 2, 3},
 				{1, 4, 5},
@@ -543,7 +512,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		},
 		{
 			[]string{"a", "b", "c"},
-			[]string{"bigint", "bigint", "bigint"},
+			[]string{"BIGINT", "BIGINT", "BIGINT"},
 			[][]driver.Value{
 				{1, 2, 3},
 				{1, 2, 8},
@@ -558,7 +527,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		// special case: avoid return same samples
 		{
 			[]string{"a", "b", "c"},
-			[]string{"bigint", "bigint", "bigint"},
+			[]string{"BIGINT", "BIGINT", "BIGINT"},
 			[][]driver.Value{
 				{1, 2, 3},
 				{1, 2, 3},
@@ -573,7 +542,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		// special case: numbers has bigger lexicographically order but lower number
 		{
 			[]string{"a", "b", "c"},
-			[]string{"bigint", "bigint", "bigint"},
+			[]string{"BIGINT", "BIGINT", "BIGINT"},
 			[][]driver.Value{
 				{12, 2, 3},
 				{111, 4, 5},
@@ -588,7 +557,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		// test string fields
 		{
 			[]string{"a", "b", "c"},
-			[]string{"bigint", "bigint", "varchar"},
+			[]string{"BIGINT", "BIGINT", "varchar"},
 			[][]driver.Value{
 				{1, 2, "3"},
 				{1, 4, "5"},
@@ -602,7 +571,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		},
 		{
 			[]string{"a", "b", "c", "d"},
-			[]string{"bigint", "bigint", "bigint", "bigint"},
+			[]string{"BIGINT", "BIGINT", "BIGINT", "BIGINT"},
 			[][]driver.Value{
 				{1, 2, 3, 4},
 				{5, 6, 7, 8},
@@ -652,34 +621,28 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		if len(handleColNames) > 0 {
 			taskChan := make(chan Task, 128)
 			quotaCols := make([]string, 0, len(handleColNames))
-			for _, col := range quotaCols {
+			for _, col := range handleColNames {
 				quotaCols = append(quotaCols, wrapBackTicks(col))
 			}
 			selectFields := strings.Join(quotaCols, ",")
-			meta := &tableMeta{
-				database:      database,
-				table:         table,
-				selectedField: selectFields,
-				specCmts: []string{
+			meta := &mockTableIR{
+				dbName:           database,
+				tblName:          table,
+				selectedField:    selectFields,
+				hasImplicitRowID: testCase.hasTiDBRowID,
+				colTypes:         handleColTypes,
+				colNames:         handleColNames,
+				specCmt: []string{
 					"/*!40101 SET NAMES binary*/;",
 				},
 			}
 
-			if testCase.hasTiDBRowID {
-				mock.ExpectExec(fmt.Sprintf("SELECT _tidb_rowid from `%s`.`%s` LIMIT 0", database, table)).
-					WillReturnResult(sqlmock.NewResult(0, 0))
-			} else {
-				mock.ExpectExec(fmt.Sprintf("SELECT _tidb_rowid from `%s`.`%s` LIMIT 0", database, table)).
-					WillReturnError(&mysql.MyError{
-						Code:    mysql.ER_BAD_FIELD_ERROR,
-						State:   "42S22",
-						Message: "Unknown column '_tidb_rowid' in 'field list'",
-					})
-				rows := sqlmock.NewRows([]string{"COLUMN_NAME", "DATA_TYPE"})
-				for i := range handleColNames {
-					rows.AddRow(handleColNames[i], handleColTypes[i])
+			if !testCase.hasTiDBRowID {
+				rows := sqlmock.NewRows(showIndexHeaders)
+				for i, handleColName := range handleColNames {
+					rows.AddRow(table, 0, "PRIMARY", i, handleColName, "A", 0, nil, nil, "", "BTREE", "", "")
 				}
-				mock.ExpectQuery("SELECT c.COLUMN_NAME, DATA_TYPE FROM").WithArgs(database, table).WillReturnRows(rows)
+				mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).WillReturnRows(rows)
 			}
 
 			rows := sqlmock.NewRows(handleColNames)
@@ -687,17 +650,21 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 				rows.AddRow(handleVal...)
 			}
 			mock.ExpectQuery(fmt.Sprintf("SELECT .* FROM `%s`.`%s` TABLESAMPLE REGIONS", database, table)).WillReturnRows(rows)
-
-			rows = sqlmock.NewRows([]string{"COLUMN_NAME", "EXTRA"})
-			for _, handleCol := range handleColNames {
-				rows.AddRow(handleCol, "")
-			}
-			mock.ExpectQuery("SELECT COLUMN_NAME,EXTRA FROM INFORMATION_SCHEMA.COLUMNS").WithArgs(database, table).
-				WillReturnRows(rows)
-			// special case, no value found, will scan whole table and try build order clause
+			// special case, no enough value to split chunks
 			if len(handleVals) == 0 {
-				mock.ExpectExec(fmt.Sprintf("SELECT _tidb_rowid from `%s`.`%s` LIMIT 0", database, table)).
-					WillReturnResult(sqlmock.NewResult(0, 0))
+				if !testCase.hasTiDBRowID {
+					rows = sqlmock.NewRows(showIndexHeaders)
+					for i, handleColName := range handleColNames {
+						rows.AddRow(table, 0, "PRIMARY", i, handleColName, "A", 0, nil, nil, "", "BTREE", "", "")
+					}
+					mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).WillReturnRows(rows)
+					mock.ExpectQuery("SHOW INDEX FROM").WillReturnRows(sqlmock.NewRows(showIndexHeaders))
+				} else {
+					d.conf.Rows = 200000
+					mock.ExpectQuery("EXPLAIN SELECT `_tidb_rowid`").
+						WillReturnRows(sqlmock.NewRows([]string{"id", "count", "task", "operator info"}).
+							AddRow("IndexReader_5", "0.00", "root", "index:IndexScan_4"))
+				}
 			}
 
 			c.Assert(d.concurrentDumpTable(tctx, conn, meta, taskChan), IsNil)
@@ -716,14 +683,13 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 
 			// special case, no value found
 			if len(handleVals) == 0 {
-				orderByClause = orderByTiDBRowID
-				query := buildSelectQuery(database, table, "*", "", "", orderByClause)
+				query := buildSelectQuery(database, table, selectFields, "", "", orderByClause)
 				checkQuery(0, query)
 				continue
 			}
 
 			for i, w := range testCase.expectedWhereClauses {
-				query := buildSelectQuery(database, table, "*", "", buildWhereCondition(d.conf, w), orderByClause)
+				query := buildSelectQuery(database, table, selectFields, "", buildWhereCondition(d.conf, w), orderByClause)
 				checkQuery(i, query)
 			}
 		}
@@ -806,6 +772,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 		ServerType:    ServerTypeTiDB,
 		ServerVersion: gcSafePointVersion,
 	}
+	d.conf.Rows = 200000
 	database := "foo"
 	table := "bar"
 
@@ -821,7 +788,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 				{"7480000000000000FF3300000000000000F8", "7480000000000000FF3300000000000000F8"},
 			},
 			[]string{"a"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[]string{
 				"",
 			},
@@ -832,7 +799,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 				{"7480000000000000FF3300000000000000F8", "7480000000000000FF3300000000000000F8"},
 			},
 			[]string{"_tidb_rowid"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[]string{
 				"",
 			},
@@ -846,7 +813,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 				{"7480000000000000FF335F728000000000FF2BF2010000000000FA", "tableID=51, _tidb_rowid=2880001"},
 			},
 			[]string{"a"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[]string{
 				"`a`<960001",
 				"`a`>=960001 and `a`<1920001",
@@ -865,7 +832,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 				{"7480000000000000FF335F728000000000FF2BF2010000000000FA", "tableID=51, _tidb_rowid=2880001"},
 			},
 			[]string{"_tidb_rowid"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[]string{
 				"`_tidb_rowid`<960001",
 				"`_tidb_rowid`>=960001 and `_tidb_rowid`<1920001",
@@ -884,16 +851,15 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 
 		// Test build tasks through table region
 		taskChan := make(chan Task, 128)
-		quotaCols := make([]string, 0, len(handleColNames))
-		for _, col := range quotaCols {
-			quotaCols = append(quotaCols, wrapBackTicks(col))
-		}
-		selectFields := strings.Join(quotaCols, ",")
-		meta := &tableMeta{
-			database:      database,
-			table:         table,
-			selectedField: selectFields,
-			specCmts: []string{
+		meta := &mockTableIR{
+			dbName:           database,
+			tblName:          table,
+			selectedField:    "*",
+			selectedLen:      len(handleColNames),
+			hasImplicitRowID: testCase.hasTiDBRowID,
+			colTypes:         handleColTypes,
+			colNames:         handleColNames,
+			specCmt: []string{
 				"/*!40101 SET NAMES binary*/;",
 			},
 		}
@@ -901,21 +867,12 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 		mock.ExpectQuery("SELECT PARTITION_NAME from INFORMATION_SCHEMA.PARTITIONS").
 			WithArgs(database, table).WillReturnRows(sqlmock.NewRows([]string{"PARTITION_NAME"}).AddRow(nil))
 
-		if testCase.hasTiDBRowID {
-			mock.ExpectExec(fmt.Sprintf("SELECT _tidb_rowid from `%s`.`%s` LIMIT 0", database, table)).
-				WillReturnResult(sqlmock.NewResult(0, 0))
-		} else {
-			mock.ExpectExec(fmt.Sprintf("SELECT _tidb_rowid from `%s`.`%s` LIMIT 0", database, table)).
-				WillReturnError(&mysql.MyError{
-					Code:    mysql.ER_BAD_FIELD_ERROR,
-					State:   "42S22",
-					Message: "Unknown column '_tidb_rowid' in 'field list'",
-				})
-			rows := sqlmock.NewRows([]string{"COLUMN_NAME", "DATA_TYPE"})
-			for i := range handleColNames {
-				rows.AddRow(handleColNames[i], handleColTypes[i])
+		if !testCase.hasTiDBRowID {
+			rows := sqlmock.NewRows(showIndexHeaders)
+			for i, handleColName := range handleColNames {
+				rows.AddRow(table, 0, "PRIMARY", i, handleColName, "A", 0, nil, nil, "", "BTREE", "", "")
 			}
-			mock.ExpectQuery("SELECT c.COLUMN_NAME, DATA_TYPE FROM").WithArgs(database, table).WillReturnRows(rows)
+			mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).WillReturnRows(rows)
 		}
 
 		rows := sqlmock.NewRows([]string{"START_KEY", "tidb_decode_key(START_KEY)"})
@@ -925,19 +882,15 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 		mock.ExpectQuery("SELECT START_KEY,tidb_decode_key\\(START_KEY\\) from INFORMATION_SCHEMA.TIKV_REGION_STATUS").
 			WithArgs(database, table).WillReturnRows(rows)
 
-		rows = sqlmock.NewRows([]string{"COLUMN_NAME", "EXTRA"})
-		for _, handleCol := range handleColNames {
-			rows.AddRow(handleCol, "")
-		}
-		mock.ExpectQuery("SELECT COLUMN_NAME,EXTRA FROM INFORMATION_SCHEMA.COLUMNS").WithArgs(database, table).
-			WillReturnRows(rows)
-
 		orderByClause := buildOrderByClauseString(handleColNames)
 		// special case, no enough value to split chunks
-		if len(regionResults) <= 1 {
-			mock.ExpectExec(fmt.Sprintf("SELECT _tidb_rowid from `%s`.`%s` LIMIT 0", database, table)).
-				WillReturnResult(sqlmock.NewResult(0, 0))
-			orderByClause = orderByTiDBRowID
+		if !testCase.hasTiDBRowID && len(regionResults) <= 1 {
+			rows = sqlmock.NewRows(showIndexHeaders)
+			for i, handleColName := range handleColNames {
+				rows.AddRow(table, 0, "PRIMARY", i, handleColName, "A", 0, nil, nil, "", "BTREE", "", "")
+			}
+			mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).WillReturnRows(rows)
+			mock.ExpectQuery("SHOW INDEX FROM").WillReturnRows(sqlmock.NewRows(showIndexHeaders))
 		}
 		c.Assert(d.concurrentDumpTable(tctx, conn, meta, taskChan), IsNil)
 		c.Assert(mock.ExpectationsWereMet(), IsNil)
@@ -973,8 +926,6 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 		ServerType:    ServerTypeTiDB,
 		ServerVersion: gcSafePointVersion,
 	}
-	database := "foo"
-	table := "bar"
 	partitions := []string{"p0", "p1", "p2"}
 
 	testCases := []struct {
@@ -1001,7 +952,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 				},
 			},
 			[]string{"_tidb_rowid"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[][]string{
 				{""}, {""}, {""},
 			},
@@ -1030,7 +981,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 				},
 			},
 			[]string{"_tidb_rowid"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[][]string{
 				{
 					"`_tidb_rowid`<10001",
@@ -1067,7 +1018,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 				},
 			},
 			[]string{"a"},
-			[]string{"bigint"},
+			[]string{"BIGINT"},
 			[][]string{
 
 				{
@@ -1096,16 +1047,15 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 
 		// Test build tasks through table region
 		taskChan := make(chan Task, 128)
-		quotaCols := make([]string, 0, len(handleColNames))
-		for _, col := range quotaCols {
-			quotaCols = append(quotaCols, wrapBackTicks(col))
-		}
-		selectFields := strings.Join(quotaCols, ",")
-		meta := &tableMeta{
-			database:      database,
-			table:         table,
-			selectedField: selectFields,
-			specCmts: []string{
+		meta := &mockTableIR{
+			dbName:           database,
+			tblName:          table,
+			selectedField:    "*",
+			selectedLen:      len(handleColNames),
+			hasImplicitRowID: testCase.hasTiDBRowID,
+			colTypes:         handleColTypes,
+			colNames:         handleColNames,
+			specCmt: []string{
 				"/*!40101 SET NAMES binary*/;",
 			},
 		}
@@ -1117,21 +1067,12 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 		mock.ExpectQuery("SELECT PARTITION_NAME from INFORMATION_SCHEMA.PARTITIONS").
 			WithArgs(database, table).WillReturnRows(rows)
 
-		if testCase.hasTiDBRowID {
-			mock.ExpectExec(fmt.Sprintf("SELECT _tidb_rowid from `%s`.`%s` LIMIT 0", database, table)).
-				WillReturnResult(sqlmock.NewResult(0, 0))
-		} else {
-			mock.ExpectExec(fmt.Sprintf("SELECT _tidb_rowid from `%s`.`%s` LIMIT 0", database, table)).
-				WillReturnError(&mysql.MyError{
-					Code:    mysql.ER_BAD_FIELD_ERROR,
-					State:   "42S22",
-					Message: "Unknown column '_tidb_rowid' in 'field list'",
-				})
-			rows = sqlmock.NewRows([]string{"COLUMN_NAME", "DATA_TYPE"})
-			for i := range handleColNames {
-				rows.AddRow(handleColNames[i], handleColTypes[i])
+		if !testCase.hasTiDBRowID {
+			rows = sqlmock.NewRows(showIndexHeaders)
+			for i, handleColName := range handleColNames {
+				rows.AddRow(table, 0, "PRIMARY", i, handleColName, "A", 0, nil, nil, "", "BTREE", "", "")
 			}
-			mock.ExpectQuery("SELECT c.COLUMN_NAME, DATA_TYPE FROM").WithArgs(database, table).WillReturnRows(rows)
+			mock.ExpectQuery(fmt.Sprintf("SHOW INDEX FROM `%s`.`%s`", database, table)).WillReturnRows(rows)
 		}
 
 		for i, partition := range partitions {
@@ -1143,20 +1084,6 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 				WillReturnRows(rows)
 		}
 
-		for range partitions {
-			rows = sqlmock.NewRows([]string{"COLUMN_NAME", "EXTRA"})
-			for _, handleCol := range handleColNames {
-				rows.AddRow(handleCol, "")
-			}
-			mock.ExpectQuery("SELECT COLUMN_NAME,EXTRA FROM INFORMATION_SCHEMA.COLUMNS").WithArgs(database, table).
-				WillReturnRows(rows)
-			// special case, dump whole table
-			if testCase.dumpWholeTable {
-				mock.ExpectExec(fmt.Sprintf("SELECT _tidb_rowid from `%s`.`%s` LIMIT 0", database, table)).
-					WillReturnResult(sqlmock.NewResult(0, 0))
-			}
-		}
-
 		orderByClause := buildOrderByClauseString(handleColNames)
 		c.Assert(d.concurrentDumpTable(tctx, conn, meta, taskChan), IsNil)
 		c.Assert(mock.ExpectationsWereMet(), IsNil)
diff --git a/v4/export/test_util.go b/v4/export/test_util.go
index 62b249e..ec06b06 100644
--- a/v4/export/test_util.go
+++ b/v4/export/test_util.go
@@ -58,17 +58,19 @@ func newMockMetaIR(targetName string, meta string, specialComments []string) Met
 }
 
 type mockTableIR struct {
-	dbName          string
-	tblName         string
-	chunIndex       int
-	data            [][]driver.Value
-	selectedField   string
-	specCmt         []string
-	colTypes        []string
-	colNames        []string
-	escapeBackSlash bool
-	rowErr          error
-	rows            *sql.Rows
+	dbName           string
+	tblName          string
+	chunIndex        int
+	data             [][]driver.Value
+	selectedField    string
+	selectedLen      int
+	specCmt          []string
+	colTypes         []string
+	colNames         []string
+	escapeBackSlash  bool
+	hasImplicitRowID bool
+	rowErr           error
+	rows             *sql.Rows
 	SQLRowIter
 }
 
@@ -84,6 +86,14 @@ func (m *mockTableIR) ShowCreateView() string {
 	return ""
 }
 
+func (m *mockTableIR) AvgRowLength() uint64 {
+	return 0
+}
+
+func (m *mockTableIR) HasImplicitRowID() bool {
+	return m.hasImplicitRowID
+}
+
 func (m *mockTableIR) Start(_ *tcontext.Context, conn *sql.Conn) error {
 	return nil
 }
@@ -116,6 +126,10 @@ func (m *mockTableIR) SelectedField() string {
 	return m.selectedField
 }
 
+func (m *mockTableIR) SelectedLen() int {
+	return m.selectedLen
+}
+
 func (m *mockTableIR) SpecialComments() StringIter {
 	return newStringIter(m.specCmt...)
 }
@@ -160,6 +174,7 @@ func newMockTableIR(databaseName, tableName string, data [][]driver.Value, speci
 		data:          data,
 		specCmt:       specialComments,
 		selectedField: "*",
+		selectedLen:   len(colTypes),
 		colTypes:      colTypes,
 		SQLRowIter:    nil,
 	}
diff --git a/v4/export/writer_util_test.go b/v4/export/writer_util_test.go
index ff249c5..63b3afe 100644
--- a/v4/export/writer_util_test.go
+++ b/v4/export/writer_util_test.go
@@ -14,6 +14,7 @@ import (
 	"github.com/pingcap/br/pkg/storage"
 	. "github.com/pingcap/check"
 	"github.com/pingcap/errors"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 var appLogger log.Logger
@@ -21,7 +22,7 @@ var appLogger log.Logger
 func TestT(t *testing.T) {
 	initColTypeRowReceiverMap()
 	logger, _, err := log.InitAppLogger(&log.Config{
-		Level:  "info",
+		Level:  "debug",
 		File:   "",
 		Format: "text",
 	})
@@ -30,22 +31,34 @@ func TestT(t *testing.T) {
 		t.Fail()
 	}
 	appLogger = logger
+	registry := prometheus.NewRegistry()
+	registry.MustRegister(prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}))
+	registry.MustRegister(prometheus.NewGoCollector())
+	RegisterMetrics(registry)
 	TestingT(t)
 }
 
-var _ = Suite(&testUtilSuite{})
+var _ = SerialSuites(&testWriteSuite{})
 
-type testUtilSuite struct {
+type testWriteSuite struct {
 	mockCfg *Config
 }
 
-func (s *testUtilSuite) SetUpSuite(_ *C) {
+func (s *testWriteSuite) SetUpSuite(_ *C) {
 	s.mockCfg = &Config{
 		FileSize: UnspecifiedSize,
 	}
+	InitMetricsVector(s.mockCfg.Labels)
 }
 
-func (s *testUtilSuite) TestWriteMeta(c *C) {
+func (s *testWriteSuite) TearDownTest(c *C) {
+	RemoveLabelValuesWithTaskInMetrics(s.mockCfg.Labels)
+
+	c.Assert(ReadGauge(finishedRowsGauge, s.mockCfg.Labels), Equals, float64(0))
+	c.Assert(ReadGauge(finishedSizeGauge, s.mockCfg.Labels), Equals, float64(0))
+}
+
+func (s *testWriteSuite) TestWriteMeta(c *C) {
 	createTableStmt := "CREATE TABLE `t1` (\n" +
 		"  `a` int(11) DEFAULT NULL\n" +
 		") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;\n"
@@ -62,7 +75,7 @@ func (s *testUtilSuite) TestWriteMeta(c *C) {
 	c.Assert(writer.String(), Equals, expected)
 }
 
-func (s *testUtilSuite) TestWriteInsert(c *C) {
+func (s *testWriteSuite) TestWriteInsert(c *C) {
 	data := [][]driver.Value{
 		{"1", "male", "bob@mail.com", "020-1234", nil},
 		{"2", "female", "sarah@mail.com", "020-1253", "healthy"},
@@ -77,7 +90,7 @@ func (s *testUtilSuite) TestWriteInsert(c *C) {
 	tableIR := newMockTableIR("test", "employee", data, specCmts, colTypes)
 	bf := storage.NewBufferWriter()
 
-	conf := configForWriteSQL(UnspecifiedSize, UnspecifiedSize)
+	conf := configForWriteSQL(s.mockCfg, UnspecifiedSize, UnspecifiedSize)
 	n, err := WriteInsert(tcontext.Background(), conf, tableIR, tableIR, bf)
 	c.Assert(n, Equals, uint64(4))
 	c.Assert(err, IsNil)
@@ -89,9 +102,11 @@ func (s *testUtilSuite) TestWriteInsert(c *C) {
 		"(3,'male','john@mail.com','020-1256','healthy'),\n" +
 		"(4,'female','sarah@mail.com','020-1235','healthy');\n"
 	c.Assert(bf.String(), Equals, expected)
+	c.Assert(ReadGauge(finishedRowsGauge, conf.Labels), Equals, float64(len(data)))
+	c.Assert(ReadGauge(finishedSizeGauge, conf.Labels), Equals, float64(len(expected)))
 }
 
-func (s *testUtilSuite) TestWriteInsertReturnsError(c *C) {
+func (s *testWriteSuite) TestWriteInsertReturnsError(c *C) {
 	data := [][]driver.Value{
 		{"1", "male", "bob@mail.com", "020-1234", nil},
 		{"2", "female", "sarah@mail.com", "020-1253", "healthy"},
@@ -109,7 +124,7 @@ func (s *testUtilSuite) TestWriteInsertReturnsError(c *C) {
 	tableIR.rowErr = rowErr
 	bf := storage.NewBufferWriter()
 
-	conf := configForWriteSQL(UnspecifiedSize, UnspecifiedSize)
+	conf := configForWriteSQL(s.mockCfg, UnspecifiedSize, UnspecifiedSize)
 	n, err := WriteInsert(tcontext.Background(), conf, tableIR, tableIR, bf)
 	c.Assert(n, Equals, uint64(3))
 	c.Assert(err, Equals, rowErr)
@@ -120,9 +135,12 @@ func (s *testUtilSuite) TestWriteInsertReturnsError(c *C) {
 		"(2,'female','sarah@mail.com','020-1253','healthy'),\n" +
 		"(3,'male','john@mail.com','020-1256','healthy');\n"
 	c.Assert(bf.String(), Equals, expected)
+	// error occurred, should revert pointer to zero
+	c.Assert(ReadGauge(finishedRowsGauge, conf.Labels), Equals, float64(0))
+	c.Assert(ReadGauge(finishedSizeGauge, conf.Labels), Equals, float64(0))
 }
 
-func (s *testUtilSuite) TestWriteInsertInCsv(c *C) {
+func (s *testWriteSuite) TestWriteInsertInCsv(c *C) {
 	data := [][]driver.Value{
 		{"1", "male", "bob@mail.com", "020-1234", nil},
 		{"2", "female", "sarah@mail.com", "020-1253", "healthy"},
@@ -135,7 +153,7 @@ func (s *testUtilSuite) TestWriteInsertInCsv(c *C) {
 
 	// test nullValue
 	opt := &csvOption{separator: []byte(","), delimiter: doubleQuotationMark, nullValue: "\\N"}
-	conf := configForWriteCSV(true, opt)
+	conf := configForWriteCSV(s.mockCfg, true, opt)
 	n, err := WriteInsertInCsv(tcontext.Background(), conf, tableIR, tableIR, bf)
 	c.Assert(n, Equals, uint64(4))
 	c.Assert(err, IsNil)
@@ -144,12 +162,15 @@ func (s *testUtilSuite) TestWriteInsertInCsv(c *C) {
 		"3,\"male\",\"john@mail.com\",\"020-1256\",\"healthy\"\n" +
 		"4,\"female\",\"sarah@mail.com\",\"020-1235\",\"healthy\"\n"
 	c.Assert(bf.String(), Equals, expected)
+	c.Assert(ReadGauge(finishedRowsGauge, conf.Labels), Equals, float64(len(data)))
+	c.Assert(ReadGauge(finishedSizeGauge, conf.Labels), Equals, float64(len(expected)))
+	RemoveLabelValuesWithTaskInMetrics(conf.Labels)
 
 	// test delimiter
 	bf.Reset()
 	opt.delimiter = quotationMark
 	tableIR = newMockTableIR("test", "employee", data, nil, colTypes)
-	conf = configForWriteCSV(true, opt)
+	conf = configForWriteCSV(s.mockCfg, true, opt)
 	n, err = WriteInsertInCsv(tcontext.Background(), conf, tableIR, tableIR, bf)
 	c.Assert(n, Equals, uint64(4))
 	c.Assert(err, IsNil)
@@ -158,12 +179,15 @@ func (s *testUtilSuite) TestWriteInsertInCsv(c *C) {
 		"3,'male','john@mail.com','020-1256','healthy'\n" +
 		"4,'female','sarah@mail.com','020-1235','healthy'\n"
 	c.Assert(bf.String(), Equals, expected)
+	c.Assert(ReadGauge(finishedRowsGauge, conf.Labels), Equals, float64(len(data)))
+	c.Assert(ReadGauge(finishedSizeGauge, conf.Labels), Equals, float64(len(expected)))
+	RemoveLabelValuesWithTaskInMetrics(conf.Labels)
 
 	// test separator
 	bf.Reset()
 	opt.separator = []byte(";")
 	tableIR = newMockTableIR("test", "employee", data, nil, colTypes)
-	conf = configForWriteCSV(true, opt)
+	conf = configForWriteCSV(s.mockCfg, true, opt)
 	n, err = WriteInsertInCsv(tcontext.Background(), conf, tableIR, tableIR, bf)
 	c.Assert(n, Equals, uint64(4))
 	c.Assert(err, IsNil)
@@ -172,6 +196,9 @@ func (s *testUtilSuite) TestWriteInsertInCsv(c *C) {
 		"3;'male';'john@mail.com';'020-1256';'healthy'\n" +
 		"4;'female';'sarah@mail.com';'020-1235';'healthy'\n"
 	c.Assert(bf.String(), Equals, expected)
+	c.Assert(ReadGauge(finishedRowsGauge, conf.Labels), Equals, float64(len(data)))
+	c.Assert(ReadGauge(finishedSizeGauge, conf.Labels), Equals, float64(len(expected)))
+	RemoveLabelValuesWithTaskInMetrics(conf.Labels)
 
 	// test delimiter that included in values
 	bf.Reset()
@@ -179,7 +206,7 @@ func (s *testUtilSuite) TestWriteInsertInCsv(c *C) {
 	opt.delimiter = []byte("ma")
 	tableIR = newMockTableIR("test", "employee", data, nil, colTypes)
 	tableIR.colNames = []string{"id", "gender", "email", "phone_number", "status"}
-	conf = configForWriteCSV(false, opt)
+	conf = configForWriteCSV(s.mockCfg, false, opt)
 	n, err = WriteInsertInCsv(tcontext.Background(), conf, tableIR, tableIR, bf)
 	c.Assert(n, Equals, uint64(4))
 	c.Assert(err, IsNil)
@@ -189,9 +216,42 @@ func (s *testUtilSuite) TestWriteInsertInCsv(c *C) {
 		"3&;,?mamamalema&;,?majohn@mamail.comma&;,?ma020-1256ma&;,?mahealthyma\n" +
 		"4&;,?mafemamalema&;,?masarah@mamail.comma&;,?ma020-1235ma&;,?mahealthyma\n"
 	c.Assert(bf.String(), Equals, expected)
+	c.Assert(ReadGauge(finishedRowsGauge, conf.Labels), Equals, float64(len(data)))
+	c.Assert(ReadGauge(finishedSizeGauge, conf.Labels), Equals, float64(len(expected)))
+	RemoveLabelValuesWithTaskInMetrics(conf.Labels)
+}
+
+func (s *testWriteSuite) TestWriteInsertInCsvReturnsError(c *C) {
+	data := [][]driver.Value{
+		{"1", "male", "bob@mail.com", "020-1234", nil},
+		{"2", "female", "sarah@mail.com", "020-1253", "healthy"},
+		{"3", "male", "john@mail.com", "020-1256", "healthy"},
+		{"4", "female", "sarah@mail.com", "020-1235", "healthy"},
+	}
+	colTypes := []string{"INT", "SET", "VARCHAR", "VARCHAR", "TEXT"}
+
+	// row errors at last line
+	rowErr := errors.New("mock row error")
+	tableIR := newMockTableIR("test", "employee", data, nil, colTypes)
+	tableIR.rowErr = rowErr
+	bf := storage.NewBufferWriter()
+
+	// test nullValue
+	opt := &csvOption{separator: []byte(","), delimiter: doubleQuotationMark, nullValue: "\\N"}
+	conf := configForWriteCSV(s.mockCfg, true, opt)
+	n, err := WriteInsertInCsv(tcontext.Background(), conf, tableIR, tableIR, bf)
+	c.Assert(n, Equals, uint64(3))
+	c.Assert(err, Equals, rowErr)
+	expected := "1,\"male\",\"bob@mail.com\",\"020-1234\",\\N\n" +
+		"2,\"female\",\"sarah@mail.com\",\"020-1253\",\"healthy\"\n" +
+		"3,\"male\",\"john@mail.com\",\"020-1256\",\"healthy\"\n"
+	c.Assert(bf.String(), Equals, expected)
+	c.Assert(ReadGauge(finishedRowsGauge, conf.Labels), Equals, float64(0))
+	c.Assert(ReadGauge(finishedSizeGauge, conf.Labels), Equals, float64(0))
+	RemoveLabelValuesWithTaskInMetrics(conf.Labels)
 }
 
-func (s *testUtilSuite) TestSQLDataTypes(c *C) {
+func (s *testWriteSuite) TestSQLDataTypes(c *C) {
 	data := [][]driver.Value{
 		{"CHAR", "char1", `'char1'`},
 		{"INT", 12345, `12345`},
@@ -206,17 +266,20 @@ func (s *testUtilSuite) TestSQLDataTypes(c *C) {
 		tableIR := newMockTableIR("test", "t", tableData, nil, colType)
 		bf := storage.NewBufferWriter()
 
-		conf := configForWriteSQL(UnspecifiedSize, UnspecifiedSize)
+		conf := configForWriteSQL(s.mockCfg, UnspecifiedSize, UnspecifiedSize)
 		n, err := WriteInsert(tcontext.Background(), conf, tableIR, tableIR, bf)
 		c.Assert(n, Equals, uint64(1))
 		c.Assert(err, IsNil)
 		lines := strings.Split(bf.String(), "\n")
 		c.Assert(len(lines), Equals, 3)
 		c.Assert(lines[1], Equals, fmt.Sprintf("(%s);", result))
+		c.Assert(ReadGauge(finishedRowsGauge, conf.Labels), Equals, float64(1))
+		c.Assert(ReadGauge(finishedSizeGauge, conf.Labels), Equals, float64(len(bf.String())))
+		RemoveLabelValuesWithTaskInMetrics(conf.Labels)
 	}
 }
 
-func (s *testUtilSuite) TestWrite(c *C) {
+func (s *testWriteSuite) TestWrite(c *C) {
 	mocksw := &mockPoisonWriter{}
 	src := []string{"test", "loooooooooooooooooooong", "poison"}
 	exp := []string{"test", "loooooooooooooooooooong", "poison_error"}
@@ -234,16 +297,26 @@ func (s *testUtilSuite) TestWrite(c *C) {
 	c.Assert(err, IsNil)
 }
 
-func configForWriteSQL(fileSize, statementSize uint64) *Config {
-	return &Config{FileSize: fileSize, StatementSize: statementSize}
+// cloneConfigForTest clones a dumpling config.
+func cloneConfigForTest(conf *Config) *Config {
+	clone := &Config{}
+	*clone = *conf
+	return clone
 }
 
-func configForWriteCSV(noHeader bool, opt *csvOption) *Config {
-	return &Config{
-		NoHeader:     noHeader,
-		CsvNullValue: opt.nullValue,
-		CsvDelimiter: string(opt.delimiter),
-		CsvSeparator: string(opt.separator),
-		FileSize:     UnspecifiedSize,
-	}
+func configForWriteSQL(config *Config, fileSize, statementSize uint64) *Config {
+	cfg := cloneConfigForTest(config)
+	cfg.FileSize = fileSize
+	cfg.StatementSize = statementSize
+	return cfg
+}
+
+func configForWriteCSV(config *Config, noHeader bool, opt *csvOption) *Config {
+	cfg := cloneConfigForTest(config)
+	cfg.NoHeader = noHeader
+	cfg.CsvNullValue = opt.nullValue
+	cfg.CsvDelimiter = string(opt.delimiter)
+	cfg.CsvSeparator = string(opt.separator)
+	cfg.FileSize = UnspecifiedSize
+	return cfg
 }