mysql查看当前连接数

 

SHOW STATUS LIKE 'Threads%';

Threads_connected显示的数值就是当前的连接数

 

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;

 

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;

 

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;

 

查看最大连接数

SHOW VARIABLES LIKE '%max_connections%';

 

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