MariaDB_mysqladmin

mysqladmin

via: https://mariadb.com/kb/en/mysqladmin/

 

mysqladmin is an administration program for the mysqld daemon. It can be used to:

• Monitor what the MySQL clients are doing (processlist)
• Get usage statistics and variables from the MariaDB / MySQL server
• Create/drop databases
• Flush (reset) logs, statistics and tables
• Kill running queries.
• Stop the server (shutdown)
• Start/stop slaves
• Check if the server is alive (ping)

Usage

mysqladmin [OPTIONS] command command....

mysqladmin Options

Option Description

-c, --count=#	Number of iterations to make. This works with -i (--sleep) only.
--debug-check	Check memory and open file usage at exit.
--debug-info	Print some debug info at exit.
-f, --force	Don't ask for confirmation on drop database; with multiple commands, continue even if an error occurs.
-C, --compress	Use compression in server/client protocol.
--character-sets-dir=name	Directory for character set files.
--default-character-set=name	Set the default character set.
-?, --help	Display this help and exit.
-h, --host=name	Connect to host.
-b, --no-beep	Turn off beep on error.
-p, --password[=name]	Password to use when connecting to server. If password is not given it's asked from the tty.
-P, --port=#	Port number to use for connection or 0 for default to, in order of preference, my.cnf, $MYSQL_TCP_PORT, /etc/services, built-in default (3306).
--protocol=name	The protocol to use for connection (tcp, socket, pipe, memory).
-r, --relative	Show difference between current and previous values when used with -i. Currently only works with extended-status.
-O, --set-variable=name	Change the value of a variable. Please note that this option is deprecated; you can set variables directly with--variable-name=value.
-s, --silent	Silently exit if one can't connect to server.
-S, --socket=name	The socket file to use for connection.
-i, --sleep=#	Execute commands repeatedly with a sleep between.
--ssl	Enable SSL for connection (automatically enabled with other flags).Disable with '--skip-ssl'.
--ssl-ca=name	CA file in PEM format (check OpenSSL docs, implies --ssl).
--ssl-capath=name	CA directory (check OpenSSL docs, implies --ssl).
--ssl-cert=name	X509 cert in PEM format (implies --ssl).
--ssl-cipher=name	SSL cipher to use (implies --ssl).
--ssl-key=name	X509 key in PEM format (implies --ssl).
--ssl-verify-server-cert	Verify server's "Common Name" in its cert against hostname used when connecting. This option is disabled by default.
-u, --user=name	User for login if not current user.
-v, --verbose	Write more information.
-V, --version	Output version information and exit.
-E, --vertical	Print output vertically. Is similar to '--relative', but prints output vertically.
-w, --wait[=#]	Wait and retry if connection is down.
--connect_timeout=#
--shutdown_timeout=#

mysqladmin Variables (--variable-name=value)

Variables and boolean options {FALSE|TRUE}  Value (after reading options)

count	0
debug-check	FALSE
debug-info	FALSE
force	FALSE
compress	FALSE
character-sets-dir	(No default value)
default-character-set	(No default value)
host	(No default value)
no-beep	FALSE
port	3306
relative	FALSE
socket	/var/run/mysqld/mysqld.sock
sleep	0
ssl	FALSE
ssl-ca	(No default value)
ssl-capath	(No default value)
ssl-cert	(No default value)
ssl-cipher	(No default value)
ssl-key	(No default value)
ssl-verify-server-cert	FALSE
user	(No default value)
verbose	FALSE
vertical	FALSE
connect_timeout	43200
shutdown_timeout	3600

mysqladmin Default Options

Default options are read from the following files in the given order:

1. /etc/my.cnf
2. /etc/mysql/my.cnf
3. /usr/etc/my.cnf
4. ~/.my.cnf

The following groups are read:

1. mysqladmin
2. client
3. client-server
4. client-mariadb

The following options may be given as the first argument:

Option Description

--print-defaults	Print the program argument list and exit.
--no-defaults	Don't read default options from any option file.
--defaults-file=#	Only read default options from the given file #.
--defaults-extra-file=#	Read this file after the global files are read.

mysqladmin Commands

Command is one or more of: (Commands may be shortened)

Command Description

create databasename	Create a new database
debug	Instruct server to write debug information to log
drop databasename	Delete a database and all its tables
extended-status	Gives an extended status message from the server
flush-all-statistics	Flush all statistics tables
flush-all-status	Flush status and statistics
flush-client-statistics	Flush client statistics
flush-hosts	Flush all cached hosts
flush-index-statistics	Flush index statistics
flush-logs	Flush all logs
flush-privileges	Reload grant tables (same as reload)
flush-slow-log	Flush slow query log
flush-status	Clear status variables
flush-table-statistics	Clear table statistics
flush-tables	Flush all tables
flush-threads	Flush the thread cache
flush-user-statistics	Flush user statistics
kill id,id,...	Kill mysql threads
password new-password	Change old password to new-password, MySQL 4.1 hashing.
old-password new-password	Change old password to new-password in old format.
ping	Check if mysqld is alive
processlist	Show list of active threads in server
reload	Reload grant tables
refresh	Flush all tables and close and open logfiles
shutdown	Take server down; see also SHUTDOWN
status	Gives a short status message from the server
start-slave	Start slave
stop-slave	Stop slave
variables	Prints variables available
version	Get version info from server

Typical example usage

Quick check of what the server is doing:

shell> mysqladmin status
Uptime: 8023  Threads: 1  Questions: 14  Slow queries: 0  Opens: 15  Flush tables: 1  Open tables: 8  Queries per second avg: 0.1
shell> mysqladmin processlist
+----+-------+-----------+----+---------+------+-------+------------------+
| Id | User  | Host      | db | Command | Time | State | Info             |
+----+-------+-----------+----+---------+------+-------+------------------+
....
+----+-------+-----------+----+---------+------+-------+------------------+

More extensive information of what is happening 'just now' changing (great for troubleshooting a slow server):

shell> mysqladmin --relative --sleep=1 extended-status | grep -v " 0 "

Check the variables for a running server:

shell> mysqladmin variables | grep datadir
| datadir                                  | /my/data/ |

Other ways to stop mysqld (unix)

If you get the error:

mysqladmin: shutdown failed; error: 'Access denied; you need (at least one of) the SHUTDOWN privilege(s) for this operation'

It means that you didn't use mysqladmin with a user that has the SUPER or SHUTDOWN privilege.

If you don't know the user password, you can still take the mysqld process down with a system killcommand:

kill -SIGTERM pid-of-mysqld-process

The above is identical to mysqladmin shutdown.

On windows you should use:

NET STOP MySQL

See also

• mytop, a 'top' like program for MariaDB/MySQL that allows you to see what the server is doing. A mytop optimized for MariaDB is included in MariaDB 5.3