Mysql命令：查看连接数量

1、Threads_connected显示的数值就是当前的连接数

SHOW STATUS LIKE 'Threads%';

2、查看当前各用户连接数据库的数量

select USER , count(*) from information_schema.processlist group by USER;

3、查看连接到数据库的客户端ip及各连接数

SELECT substring_index(host, ':',1) AS host_name,state,count(*) FROM information_schema.processlist GROUP BY state,host_name;

4、查看连接到数据库的账号、客户端ip及各连接数

SELECT user,substring_index(host, ':',1) AS host_name,state,count(*) FROM information_schema.processlist GROUP BY state,host_name;

5、查看最大连接数

SHOW VARIABLES LIKE '%max_connections%';

6、如果要修改最大连接数为500

set global max_connections=500；

也可以修改mysql配置文件

max_connections=500

然后重启mysql生效