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GNU/Linux |
CentOS 5.6 |
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mysqladmin(1) |
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mysqladmin − client for administering a MySQL server
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mysqladmin [options] command [command−options] [command [command−options]] ... |
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.
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create db_name |
Create a new database named db_name.
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debug |
Tell the server to write debug information to the error log.
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drop db_name |
Delete the database named db_name and all its tables.
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extended−status |
Display the server status variables and their values.
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flush−hosts |
Flush all information in the host cache.
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flush−logs |
Flush all logs.
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flush−privileges |
Reload the grant tables (same as reload).
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flush−status |
Clear status variables.
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flush−tables |
Flush all tables.
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flush−threads |
Flush the thread cache.
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kill id,id,... |
Kill server threads. If multiple thread ID values are given, there must be no spaces in the list.
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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 4.8, “Password Hashing as of MySQL 4.1”.)
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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 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"
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.
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ping |
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.
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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 5.5.27, “SHOW PROCESSLIST Syntax”.)
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reload |
Reload the grant tables.
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refresh |
Flush all tables and close and open log files.
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shutdown |
Stop the server.
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start−slave |
Start replication on a slave server.
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status |
Display a short server status message.
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stop−slave |
Stop replication on a slave server.
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variables |
Display the server system variables and their values.
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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
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+−−−−+−−−−−−−+−−−−−−−−−−−+−−−−+−−−−−−−−−+−−−−−−+−−−−−−−+−−−−−−−−−−−−−−−−−−+
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:
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Uptime |
The number of seconds the MySQL server has been running.
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Threads |
The number of active threads (clients).
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Questions |
The number of questions (queries) from clients since the server was started.
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Slow queries |
The number of queries that have taken more than long_query_time seconds. See Section 2.4, “The Slow Query Log”.
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Opens |
The number of tables the server has opened.
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Flush tables |
The number of flush−*, refresh, and reload commands the server has executed.
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Open tables |
The number of tables that currently are open.
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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.
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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:
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−−help, −? |
Display a help message and exit.
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−−character−sets−dir=path |
The directory where character sets are installed. See Section 2, “The Character Set Used for Data and Sorting”.
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−−compress, −C |
Compress all information sent between the client and the server if both support compression.
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−−count=N, −c N |
The number of iterations to make for repeated command execution if the −−sleep option is given.
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−−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’.
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−−default−character−set=charset_name |
Use charset_name as the default character set. See Section 2, “The Character Set Used for Data and Sorting”.
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−−force, −f |
Do not ask for confirmation for the drop db_name command. With multiple commands, continue even if an error occurs.
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−−host=host_name, −h host_name |
Connect to the MySQL server on the given host.
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−−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 Section 5.6, “Keeping Passwords Secure”.
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−−pipe, −W |
On Windows, connect to the server via a named pipe. This option applies only for connections to a local server, and only if the server supports named−pipe connections.
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−−port=port_num, −P port_num |
The TCP/IP port number to use for the connection.
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−−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 allowable values, see Section 2.2, “Connecting to the MySQL Server”.
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−−relative, −r |
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.
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−−silent, −s |
Exit silently if a connection to the server cannot be established.
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−−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.
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−−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.
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−−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 5.7.3, “SSL Command Options”.
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−−user=user_name, −u user_name |
The MySQL user name to use when connecting to the server.
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−−verbose, −v |
Verbose mode. Print more information about what the program does.
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−−version, −V |
Display version information and exit.
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−−vertical, −E |
Print output vertically. This is similar to −−relative, but prints output vertically.
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−−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. syntax:
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connect_timeout |
The maximum number of seconds before connection timeout. The default value is 43200 (12 hours).
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shutdown_timeout |
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 −−var_name=value. The −−set−variable format is deprecated.
Copyright 2007−2008 MySQL AB, 2009 Sun Microsystems, Inc.
This documentation is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License.
This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110−1301 USA or see http://www.gnu.org/licenses/.
For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/.
MySQL AB (http://www.mysql.com/).
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mysqladmin(1) | |