(mysql.info) mysqlcheck

(mysql.info) client-utility-programs
 
 8.9 `mysqlcheck' -- A Table Maintenance and Repair Program
 ==========================================================
 
 The `mysqlcheck' client checks, repairs, optimizes, and analyzes tables.
 
 `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  sql-syntax.
 
 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
      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 on
 command.
 
 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:
 
    * -help, -?
 
      Display a help message and exit.
 
    * -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.
 
    * -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.
 
    * -analyze, -a
 
      Analyze the tables.
 
    * -auto-repair
 
      If a checked table is corrupted, automatically fix it. Any
      necessary repairs are done after all tables have been checked.
 
    * -character-sets-dir=PATH
 
      The directory where character sets are installed. See 
      character-sets.
 
    * -check, -c
 
      Check the tables for errors. This is the default operation.
 
    * -check-only-changed, -C
 
      Check only tables that have changed since the last check or that
      have not been closed properly.
 
    * -check-upgrade, -g
 
      Invoke `CHECK TABLE' with the `FOR UPGRADE' option to check tables
      for incompatibilities with the current version of the server.
      This option was added in MySQL 5.0.19.
 
    * -compress
 
      Compress all information sent between the client and the server if
      both support compression.
 
    * -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.
 
    * -debug[=DEBUG_OPTIONS], -# [DEBUG_OPTIONS]
 
      Write a debugging log. A typical DEBUG_OPTIONS string is often
      `'d:t:o,FILE_NAME''.
 
    * -default-character-set=CHARSET_NAME
 
      Use CHARSET_NAME as the default character set. See 
      character-sets.
 
    * -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!
 
    * -fast, -F
 
      Check only tables that have not been closed properly.
 
    * -force, -f
 
      Continue even if an SQL error occurs.
 
    * -host=HOST_NAME, -h HOST_NAME
 
      Connect to the MySQL server on the given host.
 
    * -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
      cases.
 
    * -optimize, -o
 
      Optimize the tables.
 
    * -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 one.
 
      Specifying a password on the command line should be considered
      insecure. See  password-security.
 
    * -port=PORT_NUM, -P PORT_NUM
 
      The TCP/IP port number to use for the connection.
 
    * -protocol={TCP|SOCKET|PIPE|MEMORY}
 
      The connection protocol to use.
 
    * -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.
 
    * -repair, -r
 
      Perform a repair that can fix almost anything except unique keys
      that are not unique.
 
    * -silent, -s
 
      Silent mode. Print only error messages.
 
    * -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.
 
    * -tables
 
      Overrides the -databases or -B option. All name arguments following
      the option are regarded as table names.
 
    * -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.
 
    * -user=USER_NAME, -u USER_NAME
 
      The MySQL username to use when connecting to the server.
 
    * -verbose, -v
 
      Verbose mode. Print information about the various stages of
      program operation.
 
    * -version, -V
 
      Display version information and exit.
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