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Mysqladmin Commands Cheatsheet

mysqladmin Commands

MySQL and Linux: mysqladmin is a command-line utility the comes with MySQL server and it is used by Database Administrators to perform some basic MySQL tasks easily such as setting root password, changing root password, monitoring mysql processes, reloading privileges, checking server status etc.MySQL and Linux

In this article you will find some very useful ‘mysqladmin‘ commands that are used by system/database administrators in their day-to-day work.

How to set MySQL root password?

To set MySQL password for root user, use the following command.

# mysqladmin -u root password YOURNEWPASSWORD

How to change MySQL root password?

If you want to change or update MySQL root password

mysqladmin -u root -p123456 password 'xyz123'

How to check MySQL server is running?

To find out whether MySQL server is up and running:

# mysqladmin -u root -p ping

Enter password:
mysqld is alive

How to check which MySQL version I am running?

The following command shows MySQL version along with the current running status .

# mysqladmin -u root -p version

Enter password:
mysqladmin  Ver x.xx Distrib x.x.xx, for Linux on i686
Copyright (c) 20xx, 20xx, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Server version          x.x.xx
Protocol version        xx
Connection              Localhost via UNIX socket
UNIX socket             /var/lib/mysql/mysql.sock
Uptime:                 x days xx min xx sec

Threads: 4  Questions: 86002  Slow queries: 0  Opens: 15  Flush tables: 1  Open tables: 8  Queries per second avg: 0.059

How to find out current status of MySQL server?

To find out current status of MySQL server, use the following command. The mysqladmincommand shows the status of uptime with running threads and queries.

# mysqladmin -u root -ptmppassword status

Enter password:
Uptime: 606704  Threads: 2  Questions: 36003  Slow queries: 0  Opens: 15  Flush tables: 1  Open tables: 8  Queries per second avg: 0.059

How to check status of all MySQL server variables ?

To check all the running status of MySQL server variables and values:

# mysqladmin -u root -p extended-status

Enter password:
+------------------------------------------+-------------+
| Variable_name                            | Value       |
+------------------------------------------+-------------+
| Aborted_clients                          | 3           |
| Aborted_connects                         | 3           |
| Binlog_cache_disk_use                    | 0           |
| Binlog_cache_use                         | 0           |
| Binlog_stmt_cache_disk_use               | 0           |
| Binlog_stmt_cache_use                    | 0           |
| Bytes_received                           | 6400357     |
| Bytes_sent                               | 2610105     |
| Com_admin_commands                       | 3           |
| Com_assign_to_keycache                   | 0           |
| Com_alter_db                             | 0           |
| Com_alter_db_upgrade                     | 0           |
| Com_alter_event                          | 0           |
| Com_alter_function                       | 0           |
| Com_alter_procedure                      | 0           |
| Com_alter_server                         | 0           |
| Com_alter_table                          | 0           |
| Com_alter_tablespace                     | 0           |
+------------------------------------------+-------------+

How to see all MySQL server variables and values?

To see all the running variables and values of MySQL server:

# mysqladmin  -u root -p variables

Enter password:
+---------------------------------------------------+----------------------------------------------+
| Variable_name                                     | Value                                        |
+---------------------------------------------------+----------------------------------------------+
| auto_increment_increment                          | 1                                            |
| auto_increment_offset                             | 1                                            |
| autocommit                                        | ON                                           |
| automatic_sp_privileges                           | ON                                           |
| back_log                                          | 50                                           |
| basedir                                           | /usr                                         |
| big_tables                                        | OFF                                          |
| binlog_cache_size                                 | 32768                                        |
| binlog_direct_non_transactional_updates           | OFF                                          |
| binlog_format                                     | STATEMENT                                    |
| binlog_stmt_cache_size                            | 32768                                        |
| bulk_insert_buffer_size                           | 8388608                                      |
| character_set_client                              | latin1                                       |
| character_set_connection                          | latin1                                       |
| character_set_database                            | latin1                                       |
| character_set_filesystem                          | binary                                       |
| character_set_results                             | latin1                                       |
| character_set_server                              | latin1                                       |
| character_set_system                              | utf8                                         |
| character_sets_dir                                | /usr/share/mysql/charsets/                   |
| collation_connection                              | latin1_swedish_ci                            |
+---------------------------------------------------+----------------------------------------------+

How to check all running process ?

The following command will display all the running process of MySQL database queries.

# mysqladmin -u root -p processlist

Enter password:
+-------+---------+-----------------+---------+---------+------+-------+------------------+
| Id    | User    | Host            | db      | Command | Time | State | Info             |
+-------+---------+-----------------+---------+---------+------+-------+------------------+
| 18001 | rsyslog | localhost:38307 | rsyslog | Sleep   | 5590 |       |                  |
| 18020 | root    | localhost       |         | Query   | 0    |       | show processlist |
+-------+---------+-----------------+---------+---------+------+-------+------------------+

How to create a Database in MySQL server?

To create a new database in MySQL server use:

# mysqladmin -u root -p create databasename

Enter password:
# mysql -u root -p

Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 12327
Server version: x.x.xx MySQL Community Server (GPL) by CyberPunk

Copyright (c) 20xx, 20xx, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| databasename       |
| mysql              |
| test               |
+--------------------+
8 rows in set (0.01 sec)

mysql>

How to drop a Database in MySQL server?

To drop a Database in MySQL server use:

# mysqladmin -u root -p drop databasename

Enter password:
Dropping the database is potentially a very bad thing to do.
Any data stored in the database will be destroyed.

Do you really want to drop the 'databasename' database [y/N] y
Database "databasename" dropped

How to reload/refresh MySQL privileges?

The reload command tells the server to reload the grant tables. The refresh command flushes all tables and reopens the log files.

# mysqladmin -u root -p reload;
# mysqladmin -u root -p refresh

How to shutdown MySQL server safely?

To shutdown MySQL server safely, type the following command.

mysqladmin -u root -p shutdown

Enter password:

You can also use the following commands to start/stop MySQL server.

# /etc/init.d/mysqld stop
# /etc/init.d/mysqld start

Some useful MySQL flush commands

Some useful flush commands with their description:

  1. flush-hosts: Flush all host information from host cache.
  2. flush-tables: Flush all tables.
  3. flush-threads: Flush all threads cache.
  4. flush-logs: Flush all information logs.
  5. flush-privileges: Reload the grant tables (same as reload).
  6. flush-status: Clear status variables.
# mysqladmin -u root -p flush-hosts
# mysqladmin -u root -p flush-tables
# mysqladmin -u root -p flush-threads
# mysqladmin -u root -p flush-logs
# mysqladmin -u root -p flush-privileges
# mysqladmin -u root -p flush-status

How to kill sleeping MySQL client process?

Use the following command to identify sleeping MySQL client process.

# mysqladmin -u root -p processlist

Enter password:
+----+------+-----------+----+---------+------+-------+------------------+
| Id | User | Host      | db | Command | Time | State | Info             |
+----+------+-----------+----+---------+------+-------+------------------+
| 5  | root | localhost |    | Sleep   | 14   |       |                  |
| 8  | root | localhost |    | Query   | 0    |       | show processlist |
+----+------+-----------+----+---------+------+-------+------------------+

Now, run the following command with kill and process ID as shown below.

# mysqladmin -u root -p kill 5

Enter password:
+----+------+-----------+----+---------+------+-------+------------------+
| Id | User | Host      | db | Command | Time | State | Info             |
+----+------+-----------+----+---------+------+-------+------------------+
| 12 | root | localhost |    | Query   | 0    |       | show processlist |
+----+------+-----------+----+---------+------+-------+------------------+

If you like to kill multiple process, then pass the process ID‘s with comma separated as shown below.

# mysqladmin -u root -p kill 5,10

How to run multiple mysqladmin commands together?

If you would like to execute multiple ‘mysqladmin‘ commands together:

# mysqladmin  -u root -p processlist status version

Enter password:
+----+------+-----------+----+---------+------+-------+------------------+
| Id | User | Host      | db | Command | Time | State | Info             |
+----+------+-----------+----+---------+------+-------+------------------+
| 8  | root | localhost |    | Query   | 0    |       | show processlist |
+----+------+-----------+----+---------+------+-------+------------------+
Uptime: 3801  Threads: 1  Questions: 15  Slow queries: 0  Opens: 15  Flush tables: 1  Open tables: 8  Queries per second avg: 0.003
mysqladmin  Ver x.xx Distrib x.x.xx, for Linux on i686
Copyright (c) 20xx, 20xx, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Server version          x.x.xx
Protocol version        xx
Connection              Localhost via UNIX socket
UNIX socket             /var/lib/mysql/mysql.sock
Uptime:                 1 hour 3 min 21 sec

Threads: 1  Questions: 15  Slow queries: 0  Opens: 15  Flush tables: 1  Open tables: 8  Queries per second avg: 0.003

How to connect remote MySQL server

To connect remote MySQL server, use the -h (host)  with IP Address of remote machine.

# mysqladmin  -h 172.16.25.126 -u root -p

How to execute command on remote MySQL server

If you want to see the status of remote MySQL server:

# mysqladmin  -h 172.16.25.126 -u root -p status

How to start/stop MySQL replication on a slave server?

To start/stop MySQL replication on slave server, use the following commands.

# mysqladmin  -u root -p start-slave
# mysqladmin  -u root -p stop-slave

How to store MySQL server debug Information to logs?

Debug will write information about locks in use, memory usage and query usage to the MySQL log file including information about event scheduler.

# mysqladmin  -u root -p debug

Enter password:

How to view mysqladmin options and usage

To find out more options and usage of myslqadmin command use the help command as shown below. It will display a list of available options.

# mysqladmin --help

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