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15个实用的管理mysql的mysqladmin命令

2015-09-20 14:25 656 查看

15 Practical Usages of Mysqladmin Command For Administering MySQL Server

In all the 15 mysqladmin command-line examples below, tmppassword is used as the MySQL root user password. Please change this
to your MySQL root password.

1. How to change the MySQL root user password?

#
mysqladmin -u root -ptmppassword password 'newpassword'

#
mysql -u root -pnewpassword
Welcome
to the MySQL monitor. Commands end with ; or \g.
Your
MySQL connection id is 8
Server
version: 5.1.25-rc-community MySQL Community Server (GPL)

Type
'help;' or '\h' for help. Type '\c' to clear the buffer.

[align=justify]mysql>[/align]

2. How to check whether MySQL Server is up and running?

#
mysqladmin -u root -p ping
Enter
password:
mysqld
is alive

3. How do I find out what version of MySQL I am running?
[align=justify]Apart from giving the ‘Server version’, this command also displays the current status of the mysql server.[/align]

#
mysqladmin -u root -ptmppassword version
mysqladmin
Ver 8.42 Distrib 5.1.25-rc, for redhat-linux-gnu on i686
Copyright
(C) 2000-2006 MySQL AB
This
software comes with ABSOLUTELY NO WARRANTY. This is free software,
and
you are welcome to modify and redistribute it under the GPL license

Server
version 5.1.25-rc-community
Protocol
version 10
Connection
Localhost via UNIX socket
UNIX
socket /var/lib/mysql/mysql.sock
Uptime:
107 days 6 hours 11 min 44 sec

Threads:
1 Questions: 231976 Slow queries: 0 Opens: 17067
Flush
tables: 1 Open tables: 64 Queries per second avg: 0.25

4. What is the current status of MySQL server?

#
mysqladmin -u root -ptmppassword status
Uptime:
9267148
Threads:
1 Questions: 231977 Slow queries: 0 Opens: 17067
Flush
tables: 1 Open tables: 64 Queries per second avg: 0.25

[align=justify]The status command displays the following information:[/align]

[align=justify]Uptime: Uptime of the mysql server in seconds[/align]

[align=justify]Threads: Total number of clients connected to the server.[/align]

[align=justify]Questions: Total number of queries the server has executed since the startup.[/align]

[align=justify]Slow queries: Total number of queries whose execution time was more than long_query_time variable’s value.[/align]

[align=justify]Opens: Total number of tables opened by the server.[/align]

[align=justify]Flush tables: How many times the tables were flushed.[/align]

[align=justify]Open tables: Total number of open tables in the database.[/align]

5. How to view all the MySQL Server status variable and it’s current value?

#
mysqladmin -u root -ptmppassword extended-status
[align=justify]+-----------------------------------+-----------+[/align]
|
Variable_name | Value |
[align=justify]+-----------------------------------+-----------+[/align]
|
Aborted_clients | 579 |
|
Aborted_connects | 8 |
|
Binlog_cache_disk_use | 0 |
|
Binlog_cache_use | 0 |
|
Bytes_received | 41387238 |
|
Bytes_sent | 308401407 |
|
Com_admin_commands | 3524 |
|
Com_assign_to_keycache | 0 |
|
Com_alter_db | 0 |
|
Com_alter_db_upgrade | 0 |

6. How to display all MySQL server system variables and the values?

7. How to display all the running process/queries in the mysql database?

You can use this command effectively to debug any performance issue and identify the query that is causing problems, by running
the command automatically every 1 second as shown below.

8. How to create a MySQL Database?

#
mysqladmin -u root -ptmppassword create testdb

#
mysql -u root -ptmppassword
Welcome
to the MySQL monitor. Commands end with ; or \g.
Your
MySQL connection id is 705
Server
version: 5.1.25-rc-community MySQL Community Server (GPL)

Type
'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql>
show databases;
[align=justify]+--------------------+[/align]
|
Database |
[align=justify]+--------------------+[/align]
|
information_schema |
|
mysql |
|
sugarcrm |
|
testdb |
[align=justify]+--------------------+[/align]
4
rows in set (0.00 sec)

Note: To display all tables in a database, total number of columns, row, column types, indexes etc., use the mysqlshow
command that we discussed in our previous articles.

9. How to Delete/Drop an existing MySQL database?

#
mysqladmin -u root -ptmppassword drop testdb
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 'testdb' database [y/N] y
Database
"testdb" dropped

#
mysql -u root -ptmppassword
Welcome
to the MySQL monitor. Commands end with ; or \g.
Your
MySQL connection id is 707
Server
version: 5.1.25-rc-community MySQL Community Server (GPL)

Type
'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql>
show databases;
[align=justify]+--------------------+[/align]
|
Database |
[align=justify]+--------------------+[/align]
|
information_schema |
|
mysql |
|
sugarcrm |
[align=justify]+--------------------+[/align]
3
rows in set (0.00 sec)

10. How to reload/refresh the privilege or the grants tables?

#
mysqladmin -u root -ptmppassword reload;

[align=justify]Refresh command will flush all the tables and close/open log files.[/align]

#
mysqladmin -u root -ptmppassword refresh

11. What is the safe method to shutdown the MySQL server?

#
mysqladmin -u root -ptmppassword shutdown

#
mysql -u root -ptmppassword
ERROR
2002 (HY000): Can't connect to local MySQL server
through
socket '/var/lib/mysql/mysql.sock'
Note:
You can also use “/etc/rc.d/init.d/mysqld stop” to shutdown the server. To start the server, execute “/etc/rc.d/init.d/mysql start”

12. List of all mysqladmin flush commands.

#
mysqladmin -u root -ptmppassword flush-hosts
#
mysqladmin -u root -ptmppassword flush-logs
#
mysqladmin -u root -ptmppassword flush-privileges
#
mysqladmin -u root -ptmppassword flush-status
#
mysqladmin -u root -ptmppassword flush-tables
#
mysqladmin -u root -ptmppassword flush-threads

[align=justify]flush-hosts: Flush all information in the host cache.[/align]

[align=justify]flush-privileges: Reload the grant tables (same as reload).[/align]

[align=justify]flush-status: Clear status variables.[/align]

[align=justify]flush-threads: Flush the thread cache.[/align]

13. How to kill a hanging MySQL Client Process?
[align=justify]First identify the hanging MySQL client process using the processlist command.[/align]

Now, use the kill command and pass the process_id as shown below. To kill multiple process you can pass comma separated process
id’s.

14. How to start and stop MySQL replication on a slave server?

#
mysqladmin -u root -ptmppassword stop-slave
Slave
stopped

#
mysqladmin -u root -ptmppassword start-slave
mysqladmin:
Error starting slave: The server is not configured as slave;
fix
in config file or with CHANGE MASTER TO

15. How to combine multiple mysqladmin commands together?
[align=justify]In the example below, you can combine process-list, status and version command to get all the output together as shown below.[/align]

#
mysqladmin -u root -ptmppassword process status version
[align=justify]+----+------+-----------+----+---------+------+-------+------------------+[/align]
|
Id | User | Host | db | Command | Time | State | Info |
[align=justify]+----+------+-----------+----+---------+------+-------+------------------+[/align]
|
43 | root | localhost | | Query | 0 | | show processlist |
[align=justify]+----+------+-----------+----+---------+------+-------+------------------+[/align]

Uptime:
3135
Threads:
1 Questions: 80 Slow queries: 0 Opens: 15 Flush tables: 3
Open
tables: 0 Queries per second avg: 0.25

mysqladmin
Ver 8.42 Distrib 5.1.25-rc, for redhat-linux-gnu on i686
Copyright
(C) 2000-2006 MySQL AB
This
software comes with ABSOLUTELY NO WARRANTY. This is free software,
and
you are welcome to modify and redistribute it under the GPL license

Server
version 5.1.25-rc-community
Protocol
version 10
Connection
Localhost via UNIX socket
UNIX
socket /var/lib/mysql/mysql.sock
Uptime:
52 min 15 sec

[align=justify]You can also use the short form. as shown below:[/align]

#
mysqladmin -u root -ptmppassword pro stat ver

[align=justify]Use the option -h, to connect to a remote MySQL server and execute the mysqladmin commands as shown below.[/align]

#
mysqladmin -u root -ptmppassword pro stat ver

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