第一:查看所有连接的客户端IP
SELECT
substring_index(HOST, ':', 1) AS host_name,
state,
count(*)
FROM
information_schema.PROCESSLIST
GROUP BY
state,
host_name;
第二:查看所有的连接信息
SELECT * FROM information_schema.PROCESSLIST ;
第三:查看一个SQL最终需要查询多少条数据
EXPLAIN
SELECT * FROM gov_price gp WHERE gp.city='长沙市' ;
EXPLAIN 关键字