aria_chk — Aria table-maintenance utility


aria_chk [OPTIONS] tables[.MAI]


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


Path for control file (and logs if --logdir not used)


Path for log files


Don't open the control file. Only use this if you are sure the tables are not in use by another program!


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.


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 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.


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.


Log repair command to transaction log. This is needed if one wants to use the aria_read_log to repeat the repair


Directory where character sets are.


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 currupted 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'.


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.


Like --zerofill but does not zero out LSN of data/index pages.



Size of page buffer. Used by --safe-repair


Read buffer size for sequential reads during scanning


Size of sort buffer. Used by --recover


Internal buffer for sorting keys; Don't touch.


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 the program argument list and exit.


Don't read default options from any option file.


Only read default options from the given file #.


Read this file after the global files are read.

See Also


For more information, please refer to the MariaDB Knowledge Base, available online at


May 2014 aria_chk Ver 1.2