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查看當前連接到數據庫的用戶和Host

## 查看當前連接到數據庫的用戶和Host ##

SELECT DISTINCT 
USER,HOST 
FROM `information_schema`.`PROCESSLIST` P 
WHERE P.USER NOT IN(‘root‘,‘repl‘,‘system user‘)   \G

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查看每個host的當前連接數和總連接數

SELECT * 
FROM
 
 performance_schema.hosts;

PS1: 系統表performance_schema.hosts在MySQL 5.6.3版本中引入，用來保存MySQL服務器啟動後的連接情況。

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按照登錄用戶+登錄服務器查看登錄信息

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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按照登錄用戶+數據庫+登錄服務器查看登錄信息

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);

MySQL--查看數據庫連接信息