mysql 性能排查3板斧

1、show PROFILEs

2、show PROFILE FOR QUERY 67;

3、
SET @query_id := 67;

SELECT
    STATE,
    SUM(DURATION) AS Total_R,
    ROUND(
        100 * sum(DURATION) / (
            SELECT
                sum(DURATION)
            FROM
                information_schema.PROFILING
            WHERE
                QUERY_ID [email protected]_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;

5、SHOW PROFILE cpu for query 67;