Re: [HACKERS] Memory grows without bounds in aggregates!

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От Bruce Momjian
Тема Re: [HACKERS] Memory grows without bounds in aggregates!
Дата
Msg-id 199903291604.LAA10369@candle.pha.pa.us
обсуждение исходный текст
Ответ на Re: [HACKERS] Memory grows without bounds in aggregates!  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: [HACKERS] Memory grows without bounds in aggregates!  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-hackers
> Michael Contzen <mcontzen@dohle.com> writes:
> > [ out of memory for ]
> > stamm=> select sum(ekumsatz), sum(vkumsatz),sum(lvkumsatz),count(*) from
> > west0;
> 
> Right, this is an instance of a known problem (palloc'd temporaries for
> aggregate functions aren't freed until end of statement).  I think
> someone was looking into a quick-hack patch for aggregates, but there
> are comparable problems in evaluation of WHERE expressions, COPY, etc.
> We really need a general-purpose solution, and that probably won't
> happen till 6.6.
> 
> In the meantime, I expect that doing only one float8 sum() per select
> would take a third as much memory --- you might find that that's an
> adequate workaround for the short run.
> 

I thought we fixed this recently with that aggregate patch? 

--  Bruce Momjian                        |  http://www.op.net/~candle maillist@candle.pha.pa.us            |  (610)
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