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
              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'.

       --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.

SEE ALSO

       myisamchk(1)

       For   more   information,   please   refer   to   the   MariaDB   Knowledge  Base,  available  online  at
       https://mariadb.com/kb/