From: Andrew Dunstan <andrew@dunslane.net>
To: Joshua D. Drake <jd@commandprompt.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: [PATCHES] Partition: use triggers instead of rules
Date: Thu, 29 Nov 2007 12:19:42 -0500
Message-ID: <474EF4AE.8010405@dunslane.net> (raw)
In-Reply-To: <474EE992.2050209@commandprompt.com>
References: <20071128202615.GG24146@fetter.org>
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<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>
Joshua D. Drake wrote:
>
>> A trigger
>> will probably beat a rule for inserts/updates involving a small number
>> of rows.
>
> Which is exactly what partitioning is doing.
>
> For large numbers of rows, like an INSERT/SELECT from another
>> large table, the rule is likely to win, because its overhead is paid
>> once per query not once per row. Also, if you implement the trigger
>> with an EXECUTE (forcing a planning cycle) intead of hard-coded
>> commands, the speed advantage becomes even more dubious.
>
> Not for partitioning. Although I agree with your sentiments for normal
> operation.
>
>
Joshua, you're not making much sense here.
Tom is talking about partitioning and his analysis is correct *in the
partitioning case* AFAICS.
What basis do you have for saying he is not?
cheers
andrew
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Subject: Re: [PATCHES] Partition: use triggers instead of rules
In-Reply-To: <474EF4AE.8010405@dunslane.net>
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