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
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