Section: User Commands (1)
Updated: May 2014
aria_chk - Aria table-maintenance utility
Describe, check and repair of Aria tables.
Used without options all tables on the command will be checked for errors
- -#, --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
Abort if we can't find/read the maria_log_control
- -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
- -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
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.
- -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
- -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
- -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
Like --zerofill but does not zero out LSN of
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.
For more information, please refer to the MariaDB Knowledge Base, available online at https://mariadb.com/kb/