Today I noticed my wordpress installation got a bit slow. Apparently MySQL was very busy… Why?
...
SELECT * FROM wp_comments ORDER BY comment_date_gmt DESC LIMIT 32500, 50
SELECT * FROM wp_comments ORDER BY comment_date_gmt DESC LIMIT 32650, 50
SELECT * FROM wp_comments ORDER BY comment_date_gmt DESC LIMIT 32800, 50
... etc.
The need to run very many queries like that at the moment you open your wordpress dashboard page is not obvious to me.
Anyway “33062 comments deleted” helped a lot.
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