MySQL SQL語句性能分析
set profiling = 1;
select * from g_staff;
show profiles
www.2cto.com
SHOW profile CPU,BLOCK IO FOR query 88;
select * from NFORMATION_SCHEMA.PROFILING
將 MySQL’s SHOW PROFILES 命令的結果轉成適合閱讀的格式
SET @query_id := 5;
SELECT
STATE,
SUM(DURATION) AS Total_R,
ROUND(
100 * SUM(DURATION) / (
SELECT
SUM(DURATION)
FROM
INFORMATION_SCHEMA.PROFILING
WHERE www.2cto.com
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;
作者 bengda
