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8.4 `mysqladmin', 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,
create and drop databases, and more.
Invoke `mysqladmin' like this:
shell> mysqladmin [OPTIONS] COMMAND [COMMAND-OPTION] COMMAND ...
`mysqladmin' supports the following commands:
`create DB_NAME'
Create a new database named DB_NAME.
`debug'
Tell the server to write debug information to the error log.
`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. (Added in MySQL 3.23.16.)
`kill id,id,...'
Kill server threads.
`old-password NEW-PASSWORD'
This is like the `password' command but stores the password using
the old (pre-4.1) password-hashing format. This command was added
in MySQL 4.1.0.
`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.
If NEW-PASSWORD contains spaces or other characters that are
special to your command interpreter, you will need to enclose it
within quotes. On Windows, be sure to use double quotes rather
than single quotes; single quotes will be not be stripped from the
password, they will be interpreted as part of the password. For
example:
shell> mysqladmin password "my new password"
`ping'
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.
`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'.
`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. (Added in MySQL 3.23.16.)
`status'
Display a short server status message.
`stop-slave'
Stop replication on a slave server. (Added in MySQL 3.23.16.)
`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 |
+----+-------+-----------+----+-------------+------+-------+------+
| 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:
`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. 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' code. 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' 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:
`--help, -?'
Display a help message and exit.
`--character-sets-dir=PATH'
The directory where character sets are installed. Character
sets.
`--compress, -C'
Compress all information sent between the client and the server if
both support compression.
`--count=#, -c #'
The number of iterations to make. This works only with `--sleep'
(`-i').
`--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''.
`--default-character-set=CHARSET'
Use CHARSET as the default character set. Character sets.
Added in MySQL 4.1.9.
`--force, -f'
Don't ask for confirmation for the `drop database' 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.
`--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 will be
prompted for one.
`--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. New in MySQL 4.1.
`--relative, -r'
Show the difference between the current and previous values when
used with `-i'. Currently, 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 again and again, sleeping for DELAY seconds in
between.
`--socket=PATH, -S PATH'
The socket file to use for the connection.
`--user=USER_NAME, -u USER_NAME'
The MySQL username to use when connecting to the server.
`--verbose, -v'
Verbose mode. Print out more information on 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[=#], -w[#]'
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:
`connect_timeout'
The number of seconds before connection timeout. (Default value
is 0.)
`shutdown_timeout'
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.
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