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Re: select count() out of memory

From: "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Alvaro Herrera" <alvherre(at)commandprompt(dot)com>, tfinneid(at)student(dot)matnat(dot)uio(dot)no, "Gregory Stark" <stark(at)enterprisedb(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: select count() out of memory
Date: 2007-10-25 14:44:02
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-general
On 10/25/07, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> > tfinneid(at)student(dot)matnat(dot)uio(dot)no wrote:
> >> I did a test previously, where I created 1 million partitions (without
> >> data) and I checked the limits of pg, so I think it should be ok.
> > Clearly it's not.
> You couldn't have tested it too much --- even planning a query over so
> many tables would take forever, and actually executing it would surely
> have run the system out of locktable space before it even started
> scanning.
> The partitioning facility is designed for partition counts in the tens,
> or maybe hundreds at the most.

I've had good results well into the hundreds, but after about 400 or
so, things start to get a bit wonky.

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