| From: | "Marc G(dot) Fournier" <scrappy(at)postgresql(dot)org> |
|---|---|
| To: | Greg Stark <gsstark(at)mit(dot)edu> |
| Cc: | "Marc G(dot) Fournier" <scrappy(at)postgresql(dot)org>, Dennis Bjorklund <db(at)zigo(dot)dhs(dot)org>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: *very* slow query to summarize data for a month ... |
| Date: | 2003-11-12 16:08:56 |
| Message-ID: | 20031112120814.H56037@ganymede.hub.org |
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| Thread: | |
| Lists: | pgsql-performance |
On Wed, 12 Nov 2003, Greg Stark wrote:
>
> "Marc G. Fournier" <scrappy(at)postgresql(dot)org> writes:
>
> > Just as a side note, just doing a straight scan for the records, with no
> > SUM()/GROUP BY involved, with the month_trunc() index is still >8k msec:
>
> One of the other advantages of these aggregate tables was that we could
> purge the old data much sooner with much less resistance from the
> business. Since the reports were all still available and a lot of ad-hoc
> queries could still be done without the raw data anyways.
Actually, what I've done is do this at the 'load stage' ... but same
concept ...
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