Mysqladmin Commands, Mysqladmin Useful Commands

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-options] [command [command-options]] …

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. (See Section 4.9, “Password Hashing in MySQL 4.1”.)

· 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 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”

· 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:

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 8.5, “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 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. See Section 7.1,
“The Character Set Used for Data and Sorting”.

· –compress, -C

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

· –count=num, -c num

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. See Section 7.1, “The
Character Set Used for Data and Sorting”. Added in MySQL 4.1.9.

· –force, -f

Do not 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 are 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. Added 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[=count], -w[count]

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

· shutdown_timeout

The maximum number of seconds to wait for 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. However,
this syntax is deprecated as of MySQL 4.0.