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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jonah H. Harris <jonah.harris@gmail.com>
Cc: Alex Hunsaker <badalex@gmail.com>
Cc: Kenneth Marshall <ktm@rice.edu>
Cc: Xiao Meng <mx.cogito@gmail.com>
Cc: Zdenek Kotala <Zdenek.Kotala@sun.com>
Cc: pgsql-patches@postgresql.org
Subject: Re: hash index improving v3
Date: Tue, 23 Sep 2008 00:05:59 -0400
Message-ID: <17323.1222142759@sss.pgh.pa.us> (raw)
In-Reply-To: <36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com>
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	<20080910130401.GG6714@it.is.rice.edu>
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	<34d269d40809102117g470c4d25l55be7898fc43fc40@mail.gmail.com>
	<20080911152437.GM6714@it.is.rice.edu>
	<34d269d40809111951s7bac44cfk5dc9244693dd777c@mail.gmail.com>
	<20080912142921.GB26773@it.is.rice.edu>
	<7246.1221445012@sss.pgh.pa.us>
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	<36e682920809222030k49293e85jc57429296c5d2d76@mail.gmail.com>

"Jonah H. Harris" <jonah.harris@gmail.com> writes:
> On Mon, Sep 22, 2008 at 11:25 PM, Alex Hunsaker <badalex@gmail.com> wrote:
>> On Sun, Sep 14, 2008 at 8:16 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> I'm considering changing hashbuild to switch over at shared_buffers instead
>>> of effective_cache_size --- any thoughts about that?
>> 
>> Switching to shared_buffers gets my vote, on my test table with
>> 50,000,000 rows it takes about 8 minutes to create an index using the
>> default effective_cache_size.  With effective_cache_size set to 6GB
>> (machine has 8GB) its still going an hour later.

> Agreed.  I think using shared_buffers as a cutoff is a much better idea as well.

Already done in CVS a week or so back, but thanks for following up with
some confirmation.

			regards, tom lane



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