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(mysql.info)myisamchk general options

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General Options for `myisamchk'
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`myisamchk' supports the following options.

`-# or --debug=debug_options'
     Output debug log. The `debug_options' string often is
     `'d:t:o,filename''.

`-? or --help'
     Display a help message and exit.

`-O var=option, --set-variable var=option'
     Set the value of a variable.  The possible variables and their
     default values for myisamchk can be examined with `myisamchk
     --help':
     key_buffer_size      523264
     read_buffer_size     262136
     write_buffer_size    262136
     sort_buffer_size     2097144
     sort_key_blocks      16
     decode_bits          9

     `sort_buffer_size' is used when the keys are repaired by sorting
     keys, which is the normal case when you use `--recover'.

     `key_buffer_size' is used when you are checking the table with
     `--extended-check' or when the keys are repaired by inserting key
     row by row in to the table (like when doing normal inserts).
     Repairing through the key buffer is used in the following cases:

        * If you use `--safe-recover'.

        * If you are using a `FULLTEXT' index.

        * If the temporary files needed to sort the keys would be more
          than twice as big as when creating the key file directly.
          This is often the case when you have big `CHAR', `VARCHAR' or
          `TEXT' keys as the sort needs to store the whole keys during
          sorting. If you have lots of temporary space and you can
          force `myisamchk' to repair by sorting you can use the
          `--sort-recover' option.

     Reparing through the key buffer takes much less disk space than
     using sorting, but is also much slower.

     If you want a faster repair, set the above variables to about 1/4
     of your available memory.  You can set both variables to big
     values, as only one of the above buffers will be used at a time.

`-s or --silent'
     Silent mode.  Write output only when errors occur. You can use `-s'
     twice (`-ss') to make `myisamchk' very silent.

`-v or --verbose'
     Verbose mode.  Print more information. This can be used with `-d'
     and `-e'. Use `-v' multiple times (`-vv', `-vvv') for more
     verbosity!

`-V or --version'
     Print the `myisamchk' version and exit.

`-w or, --wait'
     Instead of giving an error if the table is locked, wait until the
     table is unlocked before continuing.  Note that if you are running
     `mysqld' on the table with `--skip-locking', the table can only be
     locked by another `myisamchk' command.