[英]MySql: How to reduce execution time of this Query?
如何自定義此查詢,大約需要30秒才能取出結果,“視頻”表中的總記錄約為50萬,“會員”表中存在300萬成員,是否有其他查詢或是否應該中斷此查詢在2選擇查詢?
user_id被索引vid_id被索引
select a.ref_url , a.source , a.video_name , a.viewers , b.username ,
c.points from
members_videos a
inner join Members b on a.user_id = b.user_id
inner join rankings c on c.user_id = b.user_id
where a.cat_ids in (123,234,52,234,423,122) not in (110,99)
order by a.vid_id Desc limit 10
有多個因素:
或者,嘗試子查詢。
SELECT *
FROM
(
select a.ref_url , a.source , a.video_name , a.viewers , b.username ,
c.points from
members_videos a
inner join Members b on a.user_id = b.user_id
inner join rankings c on c.user_id = b.user_id
where a.cat_ids in (123,234,52,234,423,122) not in (110,99)
) as T
order by T.vid_id Desc limit 10
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