On 14 September 2011 12:16, PierreW <[email protected]> wrote:
> The number of articles and comments can be big (one to two millions).
> Every once in a while, I "clean" the DB and remove older articles and
> comments:
>
> Articles.delete_all(["a_date < ?", xxxx]
> Comments.delete_all("comments.article_id not in (select id from
> articles)")
>
> The first query is executed with no problems. But the second one hangs
> and completely loads my database server.
Delete the comments first?
Comments.delete_all("comments.article_id in (select id from articles
where a_date < ?)", xxxx)
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