MySQL--查看数据库连接信息

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查看当前连接到数据库的用户和Host

## 查看当前连接到数据库的用户和Host ## SELECT DISTINCT 
USER,HOST FROM `information_schema`.`PROCESSLIST` P WHERE P.USER NOT IN('root','repl','system user')   \G

 

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查看每个host的当前连接数和总连接数

SELECT * 
FROM performance_schema.hosts;

PS1: 系统表performance_schema.hosts在MySQL 5.6.3版本中引入，用来保存MySQL服务器启动后的连接情况。

 

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按照登录用户+登录服务器查看登录信息

SELECT 
USER as login_user, LEFT(HOST,POSITION(':' IN HOST)-1) AS login_ip, count(1) as login_count FROM `information_schema`.`PROCESSLIST` P WHERE P.USER NOT IN('root','repl','system user') GROUP BY USER,LEFT(HOST,POSITION(':' IN HOST)-1) \G

 

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按照登录用户+数据库+登录服务器查看登录信息

SELECT DB as database_name, USER as login_user, LEFT(HOST,POSITION(':' IN HOST)-1) AS login_ip, count(1) as login_count FROM `information_schema`.`PROCESSLIST` P WHERE P.USER NOT IN('root','repl','system user') GROUP BY DB,USER,LEFT(HOST,POSITION(':' IN HOST)-1);