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;
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;