On 02/23/2012 05:07 AM, Marcin Mańk wrote:
>> DELETE FROM B
>> WHERE r_id IN (SELECT R.id
>> FROM R, B
>> WHERE r.end_date< (NOW() - (interval '1 day' * 30))
>> AND r.id = b.r_id
>>
> How about:
>
> DELETE FROM B
> WHERE r_id IN (SELECT distinct R.id
> FROM R WHERE r.end_date< (NOW() - (interval '1 day' * 30))
>
> ?
>
Or possibly without the DISTINCT. But I agree that the original query
shouldn't have B in the subquery - that alone could well make it crawl.
What is the distribution of end_dates? It might be worth running this in
several steps, deleting records older than, say, 90 days, 60 days, 30 days.
cheers
andrew