show processlist;

 

select host from information_schema.processlist;

 

查看那台机器及连接数

select host, current_connections from sys.host_summary;

（sys.host_summary此视图在5.7以及之后版本才有）

 

 

select substring_index(host,":",1),count(*) as conn from information_schema.processlist group by substring_index(host,":",1);