Re: Partition: use triggers instead of rules

["Joshua D. Drake" <jd(at)commandprompt(dot)com>]

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On Thu, 29 Nov 2007 17:08:29 +0000
Gregory Stark <stark(at)enterprisedb(dot)com> wrote:

> 
> "Joshua D. Drake" <jd(at)commandprompt(dot)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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