MYSQLCHECK(1)                MySQL Database System               MYSQLCHECK(1)

       mysqlcheck - a table maintenance and repair program

       mysqlcheck [options] [db_name [tbl_name ...]]

       The mysqlcheck client checks, repairs, optimizes, and analyzes tables.
       mysqlcheck is available as of MySQL 3.23.38.

       mysqlcheck is similar in function to myisamchk, but works differently.
       The main operational difference is that mysqlcheck must be used when
       the mysqld server is running, whereas myisamchk should be used when it
       is not. The benefit of using mysqlcheck is that you do not have to stop
       the server to check or repair your tables.

       mysqlcheck uses the SQL statements CHECK TABLE, REPAIR TABLE, ANALYZE
       TABLE, and OPTIMIZE TABLE in a convenient way for the user. It
       determines which statements to use for the operation you want to
       perform, and then sends the statements to the server to be executed.
       For details about which storage engines each statement works with, see
       the descriptions for those statements in Chapter 13, SQL Statement

       The MyISAM storage engine supports all four statements, so mysqlcheck
       can be used to perform all four operations on MyISAM tables. Other
       storage engines do not necessarily support all operations. In such
       cases, an error message is displayed. For example, if test.t is a
       MEMORY table, an attempt to check it produces this result:

          shell> mysqlcheck test t
          note     : The storage engine for the table doesn't support check

       There are three general ways to invoke mysqlcheck:

          shell> mysqlcheck [options] db_name [tables]
          shell> mysqlcheck [options] --databases db_name1 [db_name2 db_name3...]
          shell> mysqlcheck [options] --all-databases

       If you do not name any tables following db_name or if you use the
       --databases or --all-databases option, entire databases are checked.

       mysqlcheck has a special feature compared to other client programs. The
       default behavior of checking tables (--check) can be changed by
       renaming the binary. If you want to have a tool that repairs tables by
       default, you should just make a copy of mysqlcheck named mysqlrepair,
       or make a symbolic link to mysqlcheck named mysqlrepair. If you invoke
       mysqlrepair, it repairs tables.

       The following names can be used to change mysqlcheck default behavior:

       |mysqlrepair   | The default option is |
       |              | --repair              |
       |mysqlanalyze  | The default option is |
       |              | --analyze             |
       |mysqloptimize | The default option is |
       |              | --optimize            |

       mysqlcheck supports the following options:

       o  --help, -?

          Display a help message and exit.

       o  --all-databases, -A

          Check all tables in all databases. This is the same as using the
          --databases option and naming all the databases on the command line.

       o  --all-in-1, -1

          Instead of issuing a statement for each table, execute a single
          statement for each database that names all the tables from that
          database to be processed.

       o  --analyze, -a

          Analyze the tables.

       o  --auto-repair

          If a checked table is corrupted, automatically fix it. Any necessary
          repairs are done after all tables have been checked.

       o  --character-sets-dir=path

          The directory where character sets are installed. See Section 9.1,
          "The Character Set Used for Data and Sorting".

       o  --check, -c

          Check the tables for errors. This is the default operation.

       o  --check-only-changed, -C

          Check only tables that have changed since the last check or that
          have not been closed properly.

       o  --compress

          Compress all information sent between the client and the server if
          both support compression.

       o  --databases, -B

          Process all tables in the named databases. Normally, mysqlcheck
          treats the first name argument on the command line as a database
          name and following names as table names. With this option, it treats
          all name arguments as database names.

       o  --debug[=debug_options], -# [debug_options]

          Write a debugging log. A typical debug_options string is often

       o  --default-character-set=charset_name

          Use charset_name as the default character set. See Section 9.1, "The
          Character Set Used for Data and Sorting".

       o  --extended, -e

          If you are using this option to check tables, it ensures that they
          are 100% consistent but takes a long time.

          If you are using this option to repair tables, it runs an extended
          repair that may not only take a long time to execute, but may
          produce a lot of garbage rows also!

       o  --fast, -F

          Check only tables that have not been closed properly.

       o  --force, -f

          Continue even if an SQL error occurs.

       o  --host=host_name, -h host_name

          Connect to the MySQL server on the given host.

       o  --medium-check, -m

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

       o  --optimize, -o

          Optimize the tables.

       o  --password[=password], -p[password]

          The password to use when connecting to the server. If you use the
          short option form (-p), you cannot have a space between the option
          and the password. If you omit the password value following the
          --password or -p option on the command line, you are prompted for

          Specifying a password on the command line should be considered
          insecure. See Section 7.6, "Keeping Your Password Secure".

       o  --port=port_num, -P port_num

          The TCP/IP port number to use for the connection.

       o  --protocol={TCP|SOCKET|PIPE|MEMORY}

          The connection protocol to use. This option was added in MySQL 4.1.

       o  --quick, -q

          If you are using this option to check tables, it prevents the check
          from scanning the rows to check for incorrect links. This is the
          fastest check method.

          If you are using this option to repair tables, it tries to repair
          only the index tree. This is the fastest repair method.

       o  --repair, -r

          Perform a repair that can fix almost anything except unique keys
          that are not unique.

       o  --silent, -s

          Silent mode. Print only error messages.

       o  --socket=path, -S path

          For connections to localhost, the Unix socket file to use, or, on
          Windows, the name of the named pipe to use.

       o  --ssl*

          Options that begin with --ssl specify whether to connect to the
          server via SSL and indicate where to find SSL keys and certificates.
          See Section 7.7.3, "SSL Command Options".

       o  --tables

          Overrides the --databases or -B option. All name arguments following
          the option are regarded as table names.

       o  --use-frm

          For repair operations on MyISAM tables, get the table structure from
          the .frm file so that the table can be repaired even if the .MYI
          header is corrupted. This option was added in MySQL 4.0.5.

       o  --user=user_name, -u user_name

          The MySQL username to use when connecting to the server.

       o  --verbose, -v

          Verbose mode. Print information about the various stages of program

       o  --version, -V

          Display version information and exit.

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MySQL 4.1                         11/02/2006                     MYSQLCHECK(1)