mysqladmin is a client for performing administrative operations. You can use it to check the server's configuration and current status, create and drop databases, and more.
Invoke mysqladmin like this:
shell> mysqladmin [options] command [command-option] command ...
mysqladmin supports the following commands:
Create a new database named db_name.
Delete the database named db_name and all its tables.
Display the server status variables and their values.
Flush all information in the host cache.
Flush all logs.
Reload the grant tables (same as reload).
Clear status variables.
Flush all tables.
Flush the thread cache. (Added in MySQL 3.23.16.)
Kill server threads.
Set a new password. This changes the password to new-password for the account that you use with mysqladmin for connecting to the server.
Check whether the server is alive. The return status from mysqladmin is 0 if the server is running, 1 if it is not. Beginning with MySQL 4.0.22, the status is 0 even in case of an error such as Access denied, because that means the server is running but disallowed the connection, which is different from the server not running.
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.
Reload the grant tables.
Flush all tables and close and open log files.
Stop the server.
Start replication on a slave server. (Added in MySQL 3.23.16.)
Display a short server status message.
Stop replication on a slave server. (Added in MySQL 3.23.16.)
Display the server system variables and their values.
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 | +----+-------+-----------+----+-------------+------+-------+------+ | 6 | monty | localhost | | Processlist | 0 | | | +----+-------+-----------+----+-------------+------+-------+------+ Uptime: 10077 Threads: 1 Questions: 9 Slow queries: 0 Opens: 6 Flush tables: 1 Open tables: 2 Memory in use: 1092K Max memory used: 1116K
The mysqladmin status command result displays the following values:
The number of questions (queries) from clients since the server was started.
The number of queries that have taken more than long_query_time seconds. See the section called “The Slow Query Log”.
The number of flush ..., refresh, and reload commands the server has executed.
The amount of memory allocated directly by mysqld code. This value is displayed only when MySQL has been compiled with --with-debug=full.
The maximum amount of memory allocated directly by mysqld code. This value is displayed only when MySQL has been compiled with --with-debug=full.
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:
Display a help message and exit.
The directory where character sets are installed. See the section called “The Character Set Used for Data and Sorting”.
Compress all information sent between the client and the server if both support compression.
The number of iterations to make. This works only with --sleep (-i).
Write a debugging log. The debug_options string often is 'd:t:o,file_name'. The default is 'd:t:o,/tmp/mysqladmin.trace'.
Don't ask for confirmation for the drop database command. With multiple commands, continue even if an error occurs.
Connect to the MySQL server on the given host.
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 no password is given on the command line, you will be prompted for one.
The TCP/IP port number to use for the connection.
The connection protocol to use. New in MySQL 4.1.
Show the difference between the current and previous values when used with -i. Currently, this option works only with the extended-status command.
Exit silently if a connection to the server cannot be established.
Execute commands again and again, sleeping for delay seconds in between.
The socket file to use for the connection.
The MySQL username to use when connecting to the server.
Verbose mode. Print out more information on what the program does.
Display version information and exit.
Print output vertically. This is similar to --relative, but prints output vertically.
If the connection cannot be established, wait and retry instead of aborting. If an option 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 options:
The number of seconds before connection timeout. (Default value is 0.)
The number of seconds to wait for shutdown. (Default value is 0.)
It is also possible to set variables by using --set-variable=var_name=value or -O var_name=value syntax. However, this syntax is deprecated as of MySQL 4.0.