| From: | Shaun Thomas <sthomas(at)peak6(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Postgres refusing to use >1 core |
| Date: | 2011-05-12 16:11:21 |
| Message-ID: | 4DCC06A9.9020509@peak6.com |
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| Thread: | |
| Lists: | pgsql-performance |
On 05/12/2011 11:07 AM, Tom Lane wrote:
> I find it odd that replacing the subquery with a temp table helps,
> though, because (unless you stuck in an ANALYZE you didn't mention)
> it would have no stats at all about the number of groups in the temp
> table.
I did have an analyze initially for exactly that reason. But what I
found odd is that in my rush to execute this for the end of day reports,
I forgot that step, and it still ran fine. I've found that the planner
tends to treat un-analyzed tables somewhat pessimistically, which is
fine by me.
--
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 800 | Chicago IL, 60604
312-676-8870
sthomas(at)peak6(dot)com
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