mysql 性能剖析

profile 使用实例

set profiling_history_size=100;

show VARIABLES like 'pro%'

SELECT * from center_goods where goods_id LIMIT 200000,20

show PROFILES

set @query_id=43;

SELECT STATE, SUM(DURATION) AS Total_R,  

      ROUND(  

           100 * SUM(DURATION) /  

              (SELECT SUM(DURATION)  

               FROM INFORMATION_SCHEMA.PROFILING  

               WHERE QUERY_ID = @query_id 

            ), 2) AS Pct_R,  

         COUNT(*) AS Calls,  

         SUM(DURATION) / COUNT(*) AS "R/Call"  

      FROM INFORMATION_SCHEMA.PROFILING  

      WHERE QUERY_ID = @query_id

      GROUP BY STATE  

      ORDER BY Total_R DESC;