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Mysql 优化

分类: IT文章 • 2023-11-18 14:26:42

#查看所有连接

show processlist;

查看SQL执行计划

explain select * from table;

#查看数据库连接数

SELECT SUBSTRING_INDEX(HOST,':',1) AS ip , COUNT(*) FROM information_schema.processlist GROUP BY ip;

#查看某台应用连接数据库数

SELECT * FROM information_schema.processlist WHERE HOST LIKE '%192.168.1.122%' and TIME>90;

#查看慢SQL

SELECT * FROM mysql.`slow_log` t WHERE user_host LIKE '%192.168.1.122%' ORDER BY t.`query_time` DESC;