7.7. mysqladminClient 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 commands described in the following list. Some of the commands take an argument following the command name.
Create a new database named db_name.
Tell the server to write debug information to the error log.
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.
Kill server threads. If multiple thread ID values are given, there must be no spaces in the list.
This is like the password command but stores the password using the old (pre-4.1) password-hashing format. (See Section 4.8.9, "Password Hashing as of MySQL.")
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 quotes. On Windows, be sure to use double quotes rather than single quotes; single quotes are not stripped from the password, but rather are interpreted as part of the password. For example:
shell> mysqladmin password "my new password"
Check whether the server is alive. 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.
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.
Display a short server status message.
Stop replication on a slave server.
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 |
| 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:
The number of seconds the MySQL server has been running.
The number of active threads (clients).
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 Section 4.12.4, "The Slow Query Log."
The number of tables the server has opened.
The number of flush-*, refresh, and reload commands the server has executed.
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 --with-debug=full.
Maximum memory used
The maximum amount of memory allocated directly by mysqld. 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 4.11.1, "The Character Set Used for Data and Sorting."
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. This works only with the --sleep option.
--debug[=debug_options], -# [debug_options]
Write a debugging log. The debug_options string often is d:t:o, file_name. The default is d:t:o,/tmp/mysqladmin.trace.
Use charset_name as the default character set. See Section 4.11.1, "The Character Set Used for Data and Sorting."
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.
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 Section 4.9.6, "Keeping Your Password Secure."
--port=port_num, -P port_num
The TCP/IP port number to use for the connection.
The connection protocol to use.
Show the difference between the current and previous values when used with the --sleep option. Currently, this option works only with the extended-status command.
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.
--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.
--user=user_name, -u user_name
The MySQL username to use when connecting to the server.
Verbose mode. Print more information about 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 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 syntax:
The maximum number of seconds before connection timeout. The default value is 43200 (12 hours).
The maximum number of seconds to wait for server shutdown. The default value is 3600 (1 hour).
It is also possible to set variables by using --set-variable=var_name=value or -O var_name= value syntax. This syntax is deprecated.