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;
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