以下的文章主要向大家描述的是15个MySQL使用管理命令的描述,我前两天在相关网站看见15个MySQL数据库使用管理命令的资料,觉得挺好,就拿出来供大家分享,望大家浏览之后会有所收获。
- 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.
- MySQL>
- How to check whether MySQL Server is up and running?
- # MySQLadmin -u root -p ping
- Enter password:
- MySQLd is alive3. How do I find out what version of MySQL I am running?
- Apart from giving the ‘Server version’, this command also displays the current status of the MySQL server.
- # 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: 0.254. 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: 0.25The status command displays the following information:
- Uptime: Uptime of the MySQL server in seconds
- Threads: Total number of clients connected to the server.
- Questions: Total number of queries the server has executed since the startup.
- Slow queries: Total number of queries whose execution time waas more than long_query_time variable’s value.
- Opens: Total number of tables opened by the server.
- Flush tables: How many times the tables were flushed.
- Open tables: Total number of open tables in the database.
- 5. How to view all the MySQL Server status variable and it’s current value?
- # MySQLadmin -u root -ptmppassword extended-status
- +-----------------------------------+-----------+
- | Variable_name | Value |
- +-----------------------------------+-----------+
- | 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?
- # MySQLadmin -u root -ptmppassword variables
- +---------------------------------+---------------------------------+
- | Variable_name | Value |
- +---------------------------------+---------------------------------+
- | auto_increment_increment | 1 |
- | basedir | / |
- | big_tables | OFF |
- | binlog_format | MIXED |
- | bulk_insert_buffer_size | 8388608 |
- | character_set_client | latin1 |
- | character_set_database | latin1 |
- | character_set_filesystem | binary |
- skip.....
- | time_format | %H:%i:%s |
- | time_zone | SYSTEM |
- | timed_mutexes | OFF |
- | tmpdir | /tmp |
- | tx_isolation | REPEATABLE-READ |
- | unique_checks | ON |
- | updatable_views_with_limit | YES |
- | version | 5.1.25-rc-community |
- | version_comment | MySQL Community Server (GPL) |
- | version_compile_machine | i686 |
- | version_compile_os | redhat-linux-gnu |
- | wait_timeout | 28800 |
- +---------------------------------+---------------------------------+
7. How to display all the running process/queries in the MySQL database?- # MySQLadmin -u root -ptmppassword processlist
- +----+------+-----------+----+---------+------+-------+------------------+
- | Id | User | Host | db | Command | Time | State | Info |
- +----+------+-----------+----+---------+------+-------+------------------+
- | 20 | root | localhost | | Sleep | 36 | | |
- | 23 | root | localhost | | Query | 0 | | show processlist |
- +----+------+-----------+----+---------+------+-------+------------------+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.
- # MySQLadmin -u root -ptmppassword -i 1 processlist
- +----+------+-----------+----+---------+------+-------+------------------+
- | Id | User | Host | db | Command | Time | State | Info |
- +----+------+-----------+----+---------+------+-------+------------------+
- | 20 | root | localhost | | Sleep | 36 | | |
- | 23 | root | localhost | | Query | 0 | | show processlist |
- +----+------+-----------+----+---------+------+-------+------------------+
- +----+------+-----------+----+---------+------+-------+------------------+
- | Id | User | Host | db | Command | Time | State | Info |
- +----+------+-----------+----+---------+------+-------+------------------+
- | 24 | root | localhost | | Query | 0 | | show processlist |
- +----+------+-----------+----+---------+------+-------+------------------+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;
- +--------------------+
- | Database |
- +--------------------+
- | information_schema |
- | MySQL |
- | sugarcrm |
- | testdb |
- +--------------------+
- 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;
- +——————–+
- | Database |
- +——————–+
- | information_schema |
- | MySQL |
- | sugarcrm |
- +——————–+
- 3 rows in set (0.00 sec)10. How to reload/refresh the privilege or the grants tables?
- # MySQLadmin -u root -ptmppassword reload;Refresh command will flush all the tables and close/open log files.
- # MySQLadmin -u root -ptmppassword refresh11. 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-threadsflush-hosts: Flush all information in the host cache.
- flush-privileges: Reload the grant tables (same as reload).
- flush-status: Clear status variables.
- flush-threads: Flush the thread cache.
- 13. How to kill a hanging MySQL Client Process?
- First identify the hanging MySQL client process using the processlist command.
- # MySQLadmin -u root -ptmppassword processlist
- +----+------+-----------+----+---------+------+-------+------------------+
- | Id | User | Host | db | Command | Time | State | Info |
- +----+------+-----------+----+---------+------+-------+------------------+
- | 20 | root | localhost | | Sleep | 64 | | |
- | 24 | root | localhost | | Query | 0 | | show processlist |
- +----+------+-----------+----+---------+------+-------+------------------+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.
- # MySQLadmin -u root -ptmppassword kill 20
- # MySQLadmin -u root -ptmppassword processlist
- +----+------+-----------+----+---------+------+-------+------------------+
- | Id | User | Host | db | Command | Time | State | Info |
- +----+------+-----------+----+---------+------+-------+------------------+
- | 26 | root | localhost | | Query | 0 | | show processlist |
- +----+------+-----------+----+---------+------+-------+------------------+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 TO15. How to combine multiple MySQLadmin commands together?
- In the example below, you can combine process-list, status and version command to get all the output together as shown below.
- # MySQLadmin -u root -ptmppassword process status version
- +----+------+-----------+----+---------+------+-------+------------------+
- | Id | User | Host | db | Command | Time | State | Info |
- +----+------+-----------+----+---------+------+-------+------------------+
- | 43 | root | localhost | | Query | 0 | | show processlist |
- +----+------+-----------+----+---------+------+-------+------------------+
- 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 secYou can also use the short form as shown below:
- # MySQLadmin -u root -ptmppassword pro stat verUse the option -h,
to connect to a remote MySQL server and execute the MySQLadmin commands as shown below.- # MySQLadmin -h 192.168.1.112 -u root -ptmppassword pro stat ver
上述的相关内容就是对15个MySQL使用管理命令的描述,希望会给你带来一些帮助在此方面。
原文标题:15个MySQL使用管理命令
连接:http://www.cnblogs.com/alon/archive/2010/01/21/1652849.html
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