# RAC Attack - Oracle Cluster Database at Home/Archived Logs

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* Look at the sequence number of the two current logs. SQL> select thread#, sequence# from v$log where status='CURRENT'; THREAD# SEQUENCE# ---------- ---------- 1 6 2 3
* Execute “alter system switch logfile” and check the result. What happened? SQL> alter system switch logfile; System altered. SQL> select thread#, sequence# from v$log where status='CURRENT'; THREAD# SEQUENCE# ---------- ---------- 1 6 2 4
* Execute “alter system archive log current” and check the result. What happened now? SQL> alter system archive log current; System altered. SQL> select thread#, sequence# from v$log where status='CURRENT'; THREAD# SEQUENCE# ---------- ---------- 1 7 2 5
* Check where the archived logs are being stored by default. (Was this what you expected?) Explicitly assign them to the FRA and test to see if your changes took effect. SQL> col t format a5 SQL> col name format a70 SQL> select thread#||'.'||sequence# t, name from v$archived_log; T NAME ----- ---------------------------------------------------------------------- 1.6 /u01/app/oracle/product/11.1.0/db_1/dbs/arch1_6_685220246.dbf 1.6 /u01/app/oradata/RAC/archivelog/2009_05_04/o1_mf_1_6_4zy1wofw_.arc 2.4 /u01/app/oracle/product/11.1.0/db_1/dbs/arch2_4_685220246.dbf 2.4 /u01/app/oradata/RAC/archivelog/2009_05_04/o1_mf_2_4_4zy1wpn9_.arc SQL> alter system set log_archive_dest_1='LOCATION=USE_DB_RECOVERY_FILE_DEST'; System altered. SQL> alter system archive log current; System altered. SQL> select thread#||'.'||sequence# t, name from v$archived_log; T NAME ----- ---------------------------------------------------------------------- 2.5 /u01/app/oradata/RAC/archivelog/2009_05_04/o1_mf_2_5_4zy2xzv3_.arc 1.7 /u01/app/oradata/RAC/archivelog/2009_05_04/o1_mf_1_7_4zy2y1q6_.arc
* Take a backup of all the current archivelogs, using the default RMAN configuration. Why does it fail? collabn1:/home/oracle[RAC1]$ rman target / Recovery Manager: Release 11.1.0.6.0 - Production on Mon May 4 10:43:45 2009 connected to target database: RAC (DBID=2273202257) RMAN> backup archivelog all; Starting backup at 04-MAY-09 current log archived allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=113 instance=RAC1 device type=DISK archived log /u01/app/oradata/RAC/archivelog/2009_05_04/o1_mf_1_4_4zy03zdh_.arc not found or out of sync with catalog trying alternate file for archived log of thread 1 with sequence 4 RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03002: failure of backup command at 05/04/2009 10:47:56 RMAN-06059: expected archived log not found, lost of archived log compromises recoverability ORA-19625: error identifying file /u01/app/oracle/product/11.1.0/db_1/dbs/arch1_4_685220246.dbf ORA-27037: unable to obtain file status Linux Error: 2: No such file or directory Additional information: 3
* Crosscheck the archived logs; most will fail. Then copy the files from the local FRA on collabn2 and crosscheck them again. RMAN> crosscheck archivelog all; RMAN> list archivelog all; List of Archived Log Copies for database with db_unique_name RAC ===================================================================== Key Thrd Seq S Low Time ------- ---- ------- - --------- 6 1 4 X 26-APR-09 Name: /u01/app/oradata/RAC/archivelog/2009_05_04/o1_mf_1_4_4zy03zdh_.arc RMAN> host 'scp -r collabn2:/u01/app/oradata/RAC/archivelog/* /u01/app/oradata/RAC/archivelog/'; o1_mf_1_5_4zy044nl_.arc 100% 1024 1.0KB/s 00:00 o1_mf_2_6_4zy3k2s0_.arc 100% 12KB 11.5KB/s 00:00 o1_mf_2_3_4zy1txkr_.arc 100% 13KB 12.5KB/s 00:01 o1_mf_1_4_4zy03zdh_.arc 100% 29MB 4.9MB/s 00:06 o1_mf_2_2_4zy1dksv_.arc 100% 1209KB 1.2MB/s 00:01 o1_mf_2_4_4zy1wpn9_.arc 100% 233KB 233.0KB/s 00:00 o1_mf_2_5_4zy2xzv3_.arc 100% 19KB 19.0KB/s 00:00 RMAN> crosscheck archivelog all; RMAN> list archivelog all; List of Archived Log Copies for database with db_unique_name RAC ===================================================================== Key Thrd Seq S Low Time ------- ---- ------- - --------- 6 1 4 A 26-APR-09 Name: /u01/app/oradata/RAC/archivelog/2009_05_04/o1_mf_1_4_4zy03zdh_.arc