# aria_chk

## NAME



           aria_chk - Aria table-maintenance utility
    


## SYNOPSIS



           **aria_chk**[_OPTIONS_] _tables_[_.MAI_]
    


## DESCRIPTION



           Describe, check and repair of Aria tables.  Used without options
           all tables on the command will be checked for errors
    
       **Global options**
           **-#** , **--debug=**...
                  Output debug log. Often this is 'd:t:o,filename'.
    
           **-H** , **--HELP**
                  Print all argument options sorted alphabetically.
    
           **-?** , **--help**
                  Print all options by groups
    
           **--datadir** =_path_
                  Path for control file (and logs if **--logdir** not used)
    
           **--logdir** =_path_
                  Path for log files
    
           **--ignore-control-file**
                  Don't open the control file. Only use this if you are sure
                  the tables are not in use by another program!
    
           **--require-control-file**
                  Abort if we can't find/read the maria_log_control file
    
           **-s** , **--silent**
                  Only print errors.  One can use two **-s** to make maria_chk
                  very silent.
    
           **-t** , **--tmpdir** =_path_
                  Path for temporary files. Multiple paths can be specified,
                  separated by colon (:), they will be used in a round-robin
                  fashion.
    
           **-v** , **--verbose**
                  Print more information. This can be used with **--description**
                  and **--check**. Use many **-v** for more verbosity.
    
           **-V** , **--version**
                  Print version and exit.
    
           **-w** , **--wait**
                  Wait if table is locked.
    
       **Check options (check is the default action for aria_chk)**
           **-c** , **--check**
                  Check table for errors.
    
           **-e** , **--extend-check**
                  Check the table VERY thoroughly.  Only use this in extreme
                  cases as aria_chk should normally be able to find out if
                  the table is ok even without this switch.
    
           **-F** , **--fast**
                  Check only tables that haven't been closed properly.
    
           **-C** , **--check-only-changed**
                  Check only tables that have changed since last check.
    
           **-f** , **--force**
                  Restart with '-r' if there are any errors in the table.
                  States will be updated as with '--update-state'.
    
           **-i** , **--information**
                  Print statistics information about table that is checked.
    
           **-m** , **--medium-check**
                  Faster than extend-check, but only finds 99.99% of all
                  errors.  Should be good enough for most cases.
    
           **-T** , **--read-only**
                  Don't mark table as checked.
    
           **-U** , **--update-state**
                  Mark tables as crashed if any errors were found and clean
                  if check didn't find any errors but table was marked as
                  'not clean' before. This allows one to get rid of warnings
                  like 'table not properly closed'. If table was updated,
                  update also the timestamp for when the check was made. This
                  option is on by default!  Use **--skip-update-state** to
                  disable.
    
           **--warning-for-wrong-transaction-id**
    
                  Give a warning if we find a transaction id in the table
                  that is bigger than what exists in the control file. Use
                  **--skip-**... to disable warning
    
       **Recover (repair)/ options (When using '--recover' or '--safe-recover')**
    
           **-B** , **--backup**
                  Make a backup of the .MAD file as 'filename-time.BAK'.
    
           **--correct-checksum**
                  Correct checksum information for table.
    
           **-D** , **--data-file-length=** #
                  Max length of data file (when recreating data file when
                  it's full).
    
           **-e** , **--extend-check**
                  Try to recover every possible row from the data file
                  Normally this will also find a lot of garbage rows; Don't
                  use this option if you are not totally desperate.
    
           **-f** , **--force**
                  Overwrite old temporary files.
    
           **-k** , **--keys-used=** #
                  Tell Aria to update only some specific keys. # is a bit
                  mask of which keys to use. This can be used to get faster
                  inserts.
    
           **--max-record-length=** #
                  Skip rows bigger than this if aria_chk can't allocate
                  memory to hold it.
    
           **-r** , **--recover**
                  Can fix almost anything except unique keys that aren't
                  unique.
    
           **-n** , **--sort-recover**
                  Forces recovering with sorting even if the temporary file
                  would be very big.
    
           **-p** , **--parallel-recover**
                  Uses the same technique as '-r' and '-n', but creates all
                  the keys in parallel, in different threads.
    
           **-o** , **--safe-recover**
                  Uses old recovery method; Slower than '-r' but can handle a
                  couple of cases where '-r' reports that it can't fix the
                  data file.
    
           **--transaction-log**
                  Log repair command to transaction log. This is needed if
                  one wants to use the aria_read_log to repeat the repair
    
           **--character-sets-dir=**...
                  Directory where character sets are.
    
           **--set-collation** =_name_
                  Change the collation used by the index.
    
           **-q** , **--quick**
                  Faster repair by not modifying the data file.  One can give
                  a second '-q' to force aria_chk to modify the original
                  datafile in case of duplicate keys.  NOTE: Tables where the
                  data file is corrupted can't be fixed with this option.
    
           **-u** , **--unpack**
                  Unpack file packed with ariapack.
    
       **Other actions**
           **-a** , **--analyze**
                  Analyze distribution of keys. Will make some joins in
                  MariaDB faster.  You can check the calculated distribution
                  by using '--description **--verbose** table_name'.
    
           **--stats_method** =_name_
                  Specifies how index statistics collection code should treat
                  NULLs. Possible values of name are "nulls_unequal" (default
                  for 4.1/5.0), "nulls_equal" (emulate 4.0), and
                  "nulls_ignored".
    
           **-d** , **--description**
                  Prints some information about table.
    
           **-A** , **--set-auto-increment**[=_value_]
                  Force auto_increment to start at this or higher value If no
                  value is given, then sets the next auto_increment value to
                  the highest used value for the auto key + 1.
    
           **-S** , **--sort-index**
                  Sort index blocks.  This speeds up 'read-next' in
                  applications.
    
           **-R** , **--sort-records=** #
                  Sort records according to an index.  This makes your data
                  much more localized and may speed up things (It may be VERY
                  slow to do a sort the first time!).
    
           **-b** ,  **--block-search=** #
                  Find a record, a block at given offset belongs to.
    
           **-z** ,  **--zerofill**
                  Fill empty space in data and index files with zeroes.  This
                  makes the data file movable between different servers.
    
           **--zerofill-keep-lsn**
                  Like **--zerofill** but does not zero out LSN of data/index
                  pages.
    
       **Variables**
           **--page_buffer_size=** #
                  Size of page buffer. Used by **--safe-repair**
    
           **--read_buffer_size=** #
                  Read buffer size for sequential reads during scanning
    
           **--sort_buffer_size=** #
                  Size of sort buffer. Used by **--recover**
    
           **--sort_key_blocks=** #
                  Internal buffer for sorting keys; Don't touch.
    
           **--write_buffer_size=** #
                  Write buffer size for sequential writes during repair
    
           Default options are read from the following files in the given
           order: **/etc/my.cnf /etc/mysql/my.cnf ~/.my.cnf**
    
           The following groups are read: **aria_chk**
    
           The following options may be given as the first argument:
    
           **--print-defaults**
                  Print the program argument list and exit.
    
           **--no-defaults**
                  Don't read default options from any option file.
    
           **--defaults-file=** #
                  Only read default options from the given file #.
    
           **--defaults-extra-file=** #
                  Read this file after the global files are read.
    


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