isamchk(1)

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

USAGE
isamchk [OPTIONS] tables[.ISM]

SYNOPSIS
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]

DESCRIPTION

-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.

SEE ALSO
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://www.mysql.com/doc/en/

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

AUTHOR
Ver 1.0, distribution 4.0.21 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)