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8.7. mysqladmin — Client 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
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.
-
kill
id,id,...
Kill server threads. If multiple thread ID values are
given, there must be no spaces in the list.
-
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 5.7.9, “Password Hashing as of 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. 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"
-
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.
-
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 13.5.4.22, “SHOW PROCESSLIST Syntax”.)
-
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.
-
status
Display a short server status message.
-
stop-slave
Stop replication on a slave server.
-
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 |
+----+-------+-----------+----+---------+------+-------+------------------+
| 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:
-
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 5.11.5, “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. 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:
-
--help, -?
Display a help message and exit.
-
--character-sets-dir=path
The directory where character sets are installed. See
Section 5.10.1, “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=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'.
-
--default-character-set=charset_name
Use charset_name as the default
character set. See Section 5.10.1, “The Character Set Used for Data and Sorting”.
-
--force, -f
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.
-
--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 5.8.6, “Keeping Your Password Secure”.
-
--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.
-
--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.
-
--silent, -s
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, -v
Verbose mode. Print more information about 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 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:
It is also possible to set variables by using
--set-variable=var_name=value
or -O
var_name=value
syntax. This syntax is deprecated.
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