数据库|mysql教程
数据库-mysql教程
MySQL SQL语句性能分析 set profiling = 1;select * from g_staff; show profiles SHOW profile CPU,BLOCK IO FOR query 88; select * from NFORMATION_SCHEMA.PROFILING 将 MySQL’s SHOW PROFILES 命令的结果转成适合阅读的格式 SET @query_id := 5;SELECTSTATE,SUM(DURATION) AS Total_R,ROUND(100 * SUM(DURATION) / (SELECT SUM(DURATION)FROM INFORMATION_SCHEMA.PROFILINGWHERE QUERY_ID = @query_id),2) AS Pct_R,COUNT(*) AS Calls,SUM(DURATION) / COUNT(*) AS “R/Call”FROMINFORMATION_SCHEMA.PROFILINGWHEREQUERY_ID = @query_idGROUP BYSTATEORDER BYTotal_R DESC; 作者
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