Re: Bitmap Heap scan 8.1/8.2

From: "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com>
To: "Martin Marques" <martin(at)bugs(dot)unl(dot)edu(dot)ar>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Bitmap Heap scan 8.1/8.2
Date: 2007-10-22 21:59:56
Message-ID: 162867790710221459v2b25c706w648ff4cba27f2902@mail.gmail.com
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2007/10/22, Martin Marques <martin(at)bugs(dot)unl(dot)edu(dot)ar>:
> Pavel Stehule wrote:
> > 2007/10/22, Martin Marques <martin(at)bugs(dot)unl(dot)edu(dot)ar>:
> >> Pavel Stehule wrote:
> >>> Hello
> >>>
> >>> I am unsure, did you check config values?
> >> Don't know which ones you are talking about, but all enable_* are set to on.
> >>
> >> Anything else?
> >>
> >
> > shared_buffers
>
> 8.1:
>
> 16000
~ 128M
>
>
> 8.2:
>
> 400MB
>
>
> > work_mem
>
> 8.1:
>
> 8192
8M !!!! 8>4
>
> 8.2:
>
> 4MB
>
>
> > effective_cache_size
>
> 8.1:
>
> 1000
8M
>
> 8.2:
>
> 128MB
>
>

try

set work_mem to '8MB';
and
explain analyze select ..

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