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--check,-c

Check the table for errors. This is the default operation if you specify no option that selects an operation type explicitly.

--check-only-changed,-C

Check only tables that have changed since the last check.

--extend-check,-e

Check the table very thoroughly. This is quite slow if the table has many indexes. This option should only be used in extreme cases. Normally,myisamchk ormyisamchk --medium-check should be able to determine whether there are any errors in the table.

If you are using--extend-check and have plenty of memory, setting thekey_buffer_size variable to a large value helps the repair operation run faster.

See also the description of this option under table repair options.

For a description of the output format, seeSection 6.6.4.5, “Obtaining Table Information with myisamchk”.

--fast,-F

Check only tables that haven't been closed properly.

--force,-f

Do a repair operation automatically ifmyisamchk finds any errors in the table. The repair type is the same as that specified with the--recover or-r option.

--information,-i

Print informational statistics about the table that is checked.

--medium-check,-m

Do a check that is faster than an--extend-check operation. This finds only 99.99% of all errors, which should be good enough in most cases.

--read-only,-T

Do not mark the table as checked. This is useful if you usemyisamchk to check a table that is in use by some other application that does not use locking, such asmysqld when run with external locking disabled.

--update-state,-U

Store information in the.MYI file to indicate when the table was checked and whether 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 themysqld server is using the table and you are running it with external locking disabled.