概述

有朋友問(wèn)怎么去看連接MySQL數(shù)據(jù)庫(kù)有哪些用戶及對(duì)應(yīng)的IP地址等等信息，所以順便整理了下這塊內(nèi)容，下面是涉及的一些命令。

1、查看當(dāng)前連接到數(shù)據(jù)庫(kù)的用戶和Host

## 查看當(dāng)前連接到數(shù)據(jù)庫(kù)的用戶和Host ##
SELECT DISTINCT USER,HOST FROM `information_schema`.`PROCESSLIST` P WHERE P.USER NOT IN('root','repl','system user');

2、查看每個(gè)host的當(dāng)前連接數(shù)和總連接數(shù)

SELECT * FROM performance_schema.hosts;

PS1: 系統(tǒng)表performance_schema.hosts在MySQL 5.6.3版本中引入，用來(lái)保存MySQL服務(wù)器啟動(dòng)后的連接情況。

3、按照登錄用戶+登錄服務(wù)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 );

4、按照登錄用戶+數(shù)據(jù)庫(kù)+登錄服務(wù)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);