From: Joshua D. Drake <jd@commandprompt.com>
To: Gregory Stark <stark@enterprisedb.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Michael Paesold <mpaesold@gmx.at>
Cc: NikhilS <nikkhils@gmail.com>
Cc: David Fetter <david@fetter.org>
Cc: Jonah H. Harris <jonah.harris@gmail.com>
Cc: PostgreSQL Docs <pgsql-docs@postgresql.org>
Cc: PostgreSQL Patches <pgsql-patches@postgresql.org>
Subject: Re: Partition: use triggers instead of rules
Date: Thu, 29 Nov 2007 09:13:59 -0800
Message-ID: <20071129091359.206fd8f2@commandprompt.com> (raw)
In-Reply-To: <87zlwxj7xu.fsf@oxford.xeocode.com>
References: <20071128202615.GG24146@fetter.org>
<21686.1196283184@sss.pgh.pa.us>
<36e682920711281858x9a37039sa104036bf025de41@mail.gmail.com>
<20071129031702.GU24146@fetter.org>
<2854.1196315753@sss.pgh.pa.us>
<20071128224154.06f950c9@commandprompt.com>
<d3c4af540711290705q35ea51cdkfaa94b0c07a1aecc@mail.gmail.com>
<474EDAE2.3010705@gmx.at>
<474EE25E.3080304@commandprompt.com>
<14455.1196353045@sss.pgh.pa.us>
<474EE992.2050209@commandprompt.com>
<87zlwxj7xu.fsf@oxford.xeocode.com>
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On Thu, 29 Nov 2007 17:08:29 +0000
Gregory Stark <stark@enterprisedb.com> wrote:
>
> "Joshua D. Drake" <jd@commandprompt.com> writes:
>
> > Tom Lane wrote:
> >
> >> A trigger will probably beat a rule for inserts/updates involving
> >> a small number of rows.
> >
> > Which is exactly what partitioning is doing.
>
> Say what?
Heh, o.k. that was an ambiguous sentence. In a partitioned environment
you are likely not moving millions of rows around. Thus the "rule"
benefit is lost. You are instead performing many (sometimes
lots-o-many) inserts and updates that involve a small number of rows.
A trigger/function as Tom already pointed out is going to perform better
than a rule in that case. The benefit becomes even more pronounce the
more partitions you have.
Sincerely,
Joshua D. Drake
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Subject: Re: Partition: use triggers instead of rules
In-Reply-To: <20071129091359.206fd8f2@commandprompt.com>
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