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)-) AS login_ip,
count() 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)-)
ORDER BY COUNT() DESC;

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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)-) AS login_ip,
count() 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)-)
ORDER BY COUNT() DESC;