怎么对MySQL SQL语句性能进行分析

本篇文章为大家展示了怎么对MySQL SQL语句性能进行分析，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

MySQL SQL语句性能分析

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

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 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;

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