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 |
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Lists: | pgsql-docs pgsql-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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