From: Joshua D. Drake <jd@commandprompt.com>
To: 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 08:32:18 -0800
Message-ID: <474EE992.2050209@commandprompt.com> (raw)
In-Reply-To: <14455.1196353045@sss.pgh.pa.us>
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<20071129031702.GU24146@fetter.org>
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<20071128224154.06f950c9@commandprompt.com>
<d3c4af540711290705q35ea51cdkfaa94b0c07a1aecc@mail.gmail.com>
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<474EE25E.3080304@commandprompt.com>
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Tom Lane wrote:
> "Joshua D. Drake" <jd@commandprompt.com> writes:
>> Rules are extremely slow in comparisons and not anywhere near as
>> flexible. As I said up post yesterday... they work well in the basic
>> partitioning configuration but anything else they are extremely deficient.
>
> I think that the above claim is exceedingly narrow-minded.
We are talking about partitioning. It is supposed to be narrow-minded.
> 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.
Sincerely,
Joshua D. Drake
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Subject: Re: [PATCHES] Partition: use triggers instead of rules
In-Reply-To: <474EE992.2050209@commandprompt.com>
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