Query optimization
I have such query:
SELECT post_modified_gmt
FROM wp_posts
WHERE post_status = 'publish'
AND post_type
IN (
'post', 'page', 'attachment', 'topic'
)
ORDER BY post_date DESC
LIMIT 1
there is composite index on post_type,post_status,post_date columns but mysql uses filesort which dramaticly slows down this query execution. Is there any way to speed up this query?
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Query optimization
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