4.5.2. mysqladmin — Client for Administering a MySQL Server

mysqladmin is a client for performing administrative operations. You can use it to check the server's configuration and current status, to create and drop databases, and more.

Invoke mysqladmin like this:

shell> mysqladmin [options] command [command-arg] [command [command-arg]] ...

mysqladmin supports the following commands. Some of the commands take an argument following the command name.

  • create db_name

    Create a new database named db_name.

  • debug

    Tell the server to write debug information to the error log.

    This includes information about the Event Scheduler. See Section 19.4.5, “Event Scheduler Status”.

  • drop db_name

    Delete the database named db_name and all its tables.

  • extended-status

    Display the server status variables and their values.

  • flush-hosts

    Flush all information in the host cache.

  • flush-logs

    Flush all logs.

  • flush-privileges

    Reload the grant tables (same as reload).

  • flush-status

    Clear status variables.

  • flush-tables

    Flush all tables.

  • flush-threads

    Flush the thread cache.

  • kill id,id,...

    Kill server threads. If multiple thread ID values are given, there must be no spaces in the list.

  • old-password new-password

    This is like the password command but stores the password using the old (pre-4.1) password-hashing format. (See Section 5.3.2.3, “Password Hashing in MySQL”.)

  • password new-password

    Set a new password. This changes the password to new-password for the account that you use with mysqladmin for connecting to the server. Thus, the next time you invoke mysqladmin (or any other client program) using the same account, you will need to specify the new password.

    If the new-password value contains spaces or other characters that are special to your command interpreter, you need to enclose it within quotation marks. On Windows, be sure to use double quotation marks rather than single quotation marks; single quotation marks are not stripped from the password, but rather are interpreted as part of the password. For example:

    shell> mysqladmin password "my new password"
    

    As of MySQL 5.5.3, the new password can be omitted following the password command. In this case, mysqladmin prompts for the password value, which enables you to avoid specifying the password on the command line. Omitting the password value should be done only if password is the final command on the mysqladmin command line. Otherwise, the next argument is taken as the password.

    Caution

    Do not use this command used if the server was started with the --skip-grant-tables option. No password change will be applied. This is true even if you precede the password command with flush-privileges on the same command line to re-enable the grant tables because the flush operation occurs after you connect. However, you can use mysqladmin flush-privileges to re-enable the grant table and then use a separate mysqladmin password command to change the password.

  • ping

    Check whether the server is available. The return status from mysqladmin is 0 if the server is running, 1 if it is not. This is 0 even in case of an error such as Access denied, because this means that the server is running but refused the connection, which is different from the server not running.

  • processlist

    Show a list of active server threads. This is like the output of the SHOW PROCESSLIST statement. If the --verbose option is given, the output is like that of SHOW FULL PROCESSLIST. (See Section 12.4.5.30, “SHOW PROCESSLIST Syntax”.)

  • reload

    Reload the grant tables.

  • refresh

    Flush all tables and close and open log files.

  • shutdown

    Stop the server.

  • start-slave

    Start replication on a slave server.

  • status

    Display a short server status message.

  • stop-slave

    Stop replication on a slave server.

  • variables

    Display the server system variables and their values.

  • version

    Display version information from the server.

All commands can be shortened to any unique prefix. For example:

shell> mysqladmin proc stat
+----+-------+-----------+----+---------+------+-------+------------------+
| Id | User  | Host      | db | Command | Time | State | Info             |
+----+-------+-----------+----+---------+------+-------+------------------+
| 51 | monty | localhost |    | Query   | 0    |       | show processlist |
+----+-------+-----------+----+---------+------+-------+------------------+
Uptime: 1473624  Threads: 1  Questions: 39487
Slow queries: 0  Opens: 541  Flush tables: 1
Open tables: 19  Queries per second avg: 0.0268

The mysqladmin status command result displays the following values:

  • Uptime

    The number of seconds the MySQL server has been running.

  • Threads

    The number of active threads (clients).

  • Questions

    The number of questions (queries) from clients since the server was started.

  • Slow queries

    The number of queries that have taken more than long_query_time seconds. See Section 5.2.5, “The Slow Query Log”.

  • Opens

    The number of tables the server has opened.

  • Flush tables

    The number of flush-*, refresh, and reload commands the server has executed.

  • Open tables

    The number of tables that currently are open.

  • Memory in use

    The amount of memory allocated directly by mysqld. This value is displayed only when MySQL has been compiled with safemalloc, which is available only before MySQL 5.5.6.

  • Maximum memory used

    The maximum amount of memory allocated directly by mysqld. This value is displayed only when MySQL has been compiled with safemalloc, which is available only before MySQL 5.5.6.

If you execute mysqladmin shutdown when connecting to a local server using a Unix socket file, mysqladmin waits until the server's process ID file has been removed, to ensure that the server has stopped properly.

mysqladmin supports the following options, which can be specified on the command line or in the [mysqladmin] and [client] option file groups. mysqladmin also supports the options for processing option files described at Section 4.2.3.3.1, “Command-Line Options that Affect Option-File Handling”.

Table 4.3. mysqladmin Options

FormatOption FileDescriptionIntroductionDeprecatedRemoved
--bind-address=ip_addressbind-addressUse the specified network interface to connect to the MySQL Server5.5.8  
--compresscompressCompress all information sent between the client and the server   
--connect_timeout=secondsconnect_timeoutThe number of seconds before connection timeout   
--count=#countThe number of iterations to make for repeated command execution   
--debug[=debug_options]debugWrite a debugging log   
--debug-checkdebug-checkPrint debugging information when the program exits   
--debug-infodebug-infoPrint debugging information, memory and CPU statistics when the program exits   
--default-auth=plugindefault-auth=pluginThe authentication plugin to use5.5.9  
--default-character-set=charset_namedefault-character-setUse charset_name as the default character set   
--forceforceContinue even if an SQL error occurs   
--help Display help message and exit   
--host=host_namehostConnect to the MySQL server on the given host   
--no-beepno-beepDo not beep when errors occur   
--password[=password]passwordThe password to use when connecting to the server   
--pipe On Windows, connect to server using a named pipe   
--plugin-dir=pathplugin-dir=pathThe directory where plugins are located5.5.9  
--port=port_numportThe TCP/IP port number to use for the connection   
--protocol=typeprotocolThe connection protocol to use   
--relativerelativeShow the difference between the current and previous values when used with the --sleep option   
--shutdown_timeout=secondsshutdown_timeoutThe maximum number of seconds to wait for server shutdown   
--silentsilentSilent mode   
--sleep=delaysleepExecute commands repeatedly, sleeping for delay seconds in between   
--socket=pathsocketFor connections to localhost   
--ssl-ca=file_namessl-caThe path to a file that contains a list of trusted SSL CAs   
--ssl-capath=directory_namessl-capathThe path to a directory that contains trusted SSL CA certificates in PEM format   
--ssl-cert=file_namessl-certThe name of the SSL certificate file to use for establishing a secure connection   
--ssl-cipher=cipher_listssl-cipherA list of allowable ciphers to use for SSL encryption   
--ssl-key=file_namessl-keyThe name of the SSL key file to use for establishing a secure connection   
--ssl-verify-server-certssl-verify-server-certThe server's Common Name value in its certificate is verified against the host name used when connecting to the server   
--user=user_name,userThe MySQL user name to use when connecting to the server   
--verbose Verbose mode   
--version Display version information and exit   
--verticalverticalPrint query output rows vertically (one line per column value)   
--waitwaitIf the connection cannot be established, wait and retry instead of aborting   
  • --help, -?

    Display a help message and exit.

  • --bind-address=ip_address

    On a computer having multiple network interfaces, this option can be used to select which interface is employed when connecting to the MySQL server.

    This option is supported beginning with MySQL 5.5.8.

  • --character-sets-dir=path

    The directory where character sets are installed. See Section 9.5, “Character Set Configuration”.

  • --compress, -C

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

  • --count=N, -c N

    The number of iterations to make for repeated command execution if the --sleep option is given.

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

    Write a debugging log. A typical debug_options string is 'd:t:o,file_name'. The default is 'd:t:o,/tmp/mysqladmin.trace'.

  • --debug-check

    Print some debugging information when the program exits.

  • --debug-info

    Print debugging information and memory and CPU usage statistics when the program exits.

  • --default-auth=plugin

    The client-side authentication plugin to use. See Section 5.5.6, “Pluggable Authentication”.

    This option was added in MySQL 5.5.9.

  • --default-character-set=charset_name

    Use charset_name as the default character set. See Section 9.5, “Character Set Configuration”.

  • --force, -f

    Do not ask for confirmation for the drop db_name command. With multiple commands, continue even if an error occurs.

  • --host=host_name, -h host_name

    Connect to the MySQL server on the given host.

  • --no-beep, -b

    Suppress the warning beep that is emitted by default for errors such as a failure to connect to the server.

  • --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, mysqladmin prompts for one.

    Specifying a password on the command line should be considered insecure. See Section 5.3.2.2, “End-User Guidelines for Password Security”. You can use an option file to avoid giving the password on the command line.

  • --pipe, -W

    On Windows, connect to the server using a named pipe. This option applies only if the server supports named-pipe connections.

  • --plugin-dir=path

    The directory in which to look for plugins. It may be necessary to specify this option if the --default-auth option is used to specify an authentication plugin but mysql does not find it. See Section 5.5.6, “Pluggable Authentication”.

    This option was added in MySQL 5.5.9.

  • --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 for connecting to the server. It is useful when the other connection parameters normally would cause a protocol to be used other than the one you want. For details on the permissible values, see Section 4.2.2, “Connecting to the MySQL Server”.

  • --relative, -r

    Show the difference between the current and previous values when used with the --sleep option. This option works only with the extended-status command.

  • --silent, -s

    Exit silently if a connection to the server cannot be established.

  • --sleep=delay, -i delay

    Execute commands repeatedly, sleeping for delay seconds in between. The --count option determines the number of iterations. If --count is not given, mysqladmin executes commands indefinitely until interrupted.

  • --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.

  • --ssl*

    Options that begin with --ssl specify whether to connect to the server using SSL and indicate where to find SSL keys and certificates. See Section 5.5.8.3, “SSL Command Options”.

  • --user=user_name, -u user_name

    The MySQL user name to use when connecting to the server.

  • --verbose, -v

    Verbose mode. Print more information about what the program does.

  • --version, -V

    Display version information and exit.

  • --vertical, -E

    Print output vertically. This is similar to --relative, but prints output vertically.

  • --wait[=count], -w[count]

    If the connection cannot be established, wait and retry instead of aborting. If a count value is given, it indicates the number of times to retry. The default is one time.

You can also set the following variables by using --var_name=value The --set-variable format is deprecated and was removed in MySQL 5.5.3. syntax:

  • connect_timeout

    The maximum number of seconds before connection timeout. The default value is 43200 (12 hours).

  • shutdown_timeout

    The maximum number of seconds to wait for server shutdown. The default value is 3600 (1 hour).

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