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Re: [PATCHES] Partition: use triggers instead of rules

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Michael Paesold <mpaesold(at)gmx(dot)at>, NikhilS <nikkhils(at)gmail(dot)com>, David Fetter <david(at)fetter(dot)org>, "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com>, PostgreSQL Docs <pgsql-docs(at)postgresql(dot)org>, PostgreSQL Patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: [PATCHES] Partition: use triggers instead of rules
Date: 2007-11-29 16:32:18
Message-ID: 474EE992.2050209@commandprompt.com (view raw or flat)
Thread:
Lists: pgsql-docspgsql-patches
Tom Lane wrote:
> "Joshua D. Drake" <jd(at)commandprompt(dot)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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