2k rows update is very slow in MySQL

Posted by sergeik on Stack Overflow See other posts from Stack Overflow or by sergeik
Published on 2010-04-20T10:01:29Z Indexed on 2010/04/20 10:03 UTC
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mysql

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Performance

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update

Hi all, I have 2 tables: 1. news (450k rows) 2. news_tags (3m rows)

There are some triggers on news table update which updating listings. This SQL executes too long...

UPDATE news
SET news_category = some_number
WHERE news_id IN (SELECT news_id
                  FROM news_tags
                  WHERE tag_id = some_number); #about 3k rows

How can I make it faster?

Thanks in advance, S.

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