4.4.6.3 Check Options for myisamchk

-c or --check

Check table for errors. This is the default operation if you are not giving myisamchk any options that override this.

-e or --extend-check

Check the table very thoroughly (which is quite slow if you have many indexes). This option should only be used in extreme cases. Normally, myisamchk or myisamchk --medium-check should, in most cases, be able to find out if there are any errors in the table. If you are using --extended-check and have much memory, you should increase the value of key_buffer_size a lot!

-F or --fast

Check only tables that haven't been closed properly.

-C or --check-only-changed

Check only tables that have changed since the last check.

-f or --force

Restart myisamchk with -r (repair) on the table, if myisamchk finds any errors in the table.

-i or --information

Print informational statistics about the table that is checked.

-m or --medium-check

Faster than extended-check, but only finds 99.99% of all errors. Should, however, be good enough for most cases.

-U or --update-state

Store in the `.MYI' file when the table was checked and if the table crashed. This should be used to get full benefit of the --check-only-changed option, but you shouldn't use this option if the mysqld server is using the table and you are running mysqld with --skip-external-locking.

-T or --read-only

Don't mark table as checked. This is useful if you use myisamchk to check a table that is in use by some other application that doesn't use locking (like mysqld --skip-external-locking).

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