isamchk - Description, check and repair of ISAM tables. Used without options all tables on the command will be checked for errors

isamchk [OPTIONS] tables[.ISM]

isamchk [-a|--analyze] [-#|--debug=...] [--character-sets-dir=...] [-C|--default-character-set=...] [-d|--description] [-e|--extend-check] [-f|--force] [-?|--help] [-i|--information] [-k|--keys-used=#] [-l|--no-symlinks] [-q|--quick] [-r|--recover] [-o|--safe-recover] [-O|--set-variable var=option] [-s|--silent] [-S|--sort-index] [-R|--sort-records=#] [-u|--unpack] [-v|--verbose] [-V|--version] [-w|--wait]

-a|--analyze

Analyze distribution of keys. Will make some joins in MySQL faster.

-#|--debug=...

Output debug log. Often this is 'd:t:o ,filename`

--character-sets-dir=...

Directory where character sets are

-C|--default-character-set=...

Set the default character set

-d|--description

Prints some information about table.

-e|--extend-check

Check the table VERY thoroughly. One need use this only in extreme cases as isamchk should normally find all errors even without this switch

-f|--force

Overwrite old temporary files. If one uses -f when checking tables (running isamchk without -r), isamchk will automatically restart with -r on any wrong table.

-?|--help

Display help and exit.

-i|--information

Print statistics information about the table

-k|--keys-used=#

Used with '-r'. Tell ISAM to update only the first # keys. This can be used to get faster inserts!

-l|--no-symlinks

Do not follow symbolic links when repairing. Normally isamchk repairs the table a symlink points at.

-q|--quick

Used with -r to get a faster repair. (The data file isn't touched.) One can give a second '-q' to force isamchk to modify the original datafile.

-r|--recover

Can fix almost anything except unique keys that aren't unique.

-o|--safe-recover

Uses old recovery method; slower than '-r' but can handle a couple of cases that '-r' cannot handle.

-O| --set-variable var=option

Change the value of a variable.

-s|--silent

Only print errors. One can use two -s to make isamchk very silent

-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!)

-u|--unpack

Unpack file packed with pack_isam.

-v|--verbose

Print more information. This can be used with -d and -e. Use many -v for more verbosity!

-V|--version

Print version and exit.

-w|--wait

Wait if table is locked.

isamlog(1), mysql(1), mysqlaccess(1), mysqladmin(1), mysqld(1), mysqld_multi(1), mysqld_safe(1), mysqldump(1), mysql_fix_privilege_tables(1), mysqlshow(1), mysql_zap(1), perror(1), replace(1)

For more information please refer to the MySQL reference manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/mysql/en

Please refer to http://bugs.mysql.com/ to report bugs.

Ver 1.0, distribution 4.1.15 Michael (Monty) Widenius (monty@mysql.com), MySQL AB (http://www.mysql.com/). This software comes with no warranty. Manual page by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer (http://www.mercurmedia.com)