--check, -c

Check the table for errors. This is the default operation if you specify no option that selects an operation type explicitly.检查表格是否有错误。如果未指定明确选择操作类型的选项，则这是默认操作。

--check-only-changed, -C

Check only tables that have changed since the last check.仅检查自上次检查以来发生更改的表。

--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. 仔细检查桌子。如果表有很多索引，这会很慢。此选项仅应在极端情况下使用。Normally, myisamchk or myisamchk --medium-check should be able to determine whether there are any errors in the table.通常，myisamchk或myisamchk --media-check应该能够确定表中是否有任何错误。

If you are using --extend-check and have plenty of memory, setting the key_buffer_size variable to a large value helps the repair operation run faster.如果您正在使用--extend-check并且有足够的内存，将key_buffer_size变量设置为较大的值有助于修复操作更快地运行。

See also the description of this option under table repair options.另请参阅表修复选项下此选项的说明。

For a description of the output format, see Section 4.6.4.5, “Obtaining Table Information with myisamchk”.有关输出格式的说明，请参阅第4.6.4.5节，“使用myisamchk获取表信息”。

--fast, -F

Check only tables that haven't been closed properly.只检查未正确关闭的桌子。

--force, -f

Do a repair operation automatically if myisamchk finds any errors in the table. 如果myisamchk在表中发现任何错误，则自动执行修复操作。The repair type is the same as that specified with the --recover or -r option.修复类型与使用--recover或-r选项指定的修复类型相同。

--information, -i

Print informational statistics about the table that is checked.打印有关所检查表的信息统计信息。

--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.执行比--extend-check操作更快的检查。这只发现了99.99%的错误，在大多数情况下应该已经足够好了。

--read-only, -T

Do not mark the table as checked. This is useful if you use myisamchk to check a table that is in use by some other application that does not use locking, such as mysqld when run with external locking disabled.不要将表格标记为已选中。如果您使用myisamchk检查其他不使用锁定的应用程序（如禁用外部锁定运行时的mysqld）正在使用的表，这将非常有用。

--update-state, -U

Store information in the .MYI file to indicate when the table was checked and whether the table crashed. 将信息存储在.MYI文件中，以指示表何时被检查以及表是否崩溃。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 it with external locking disabled.这应该用于获得--check-only-changed选项的全部好处，但如果mysqld服务器正在使用该表，并且您在禁用外部锁定的情况下运行它，则不应该使用此选项。