From: | Dror Matalon <dror(at)zapatec(dot)com> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Speeding up Aggregates |
Date: | 2003-10-03 22:03:58 |
Message-ID: | 20031003220358.GR87525@rlx11.zapatec.com |
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Thread: | |
Lists: | pgsql-performance |
On Fri, Oct 03, 2003 at 02:35:46PM -0700, Josh Berkus wrote:
> Dror,
>
> > I am using 7.4, and had tried NOT EXISTS and didn't see any
> > improvements.
>
> It wouldn't if you're using 7.4, which has improved IN performance immensely.
>
> What happens if you stop using a function and instead use a subselect?
An improvement. Now I'm getting in the 200 msec response time.
And by the way, I tried "not exists" again and it actually runs slower
than "not in."
>
> --
> -Josh Berkus
> Aglio Database Solutions
> San Francisco
>
>
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--
Dror Matalon
Zapatec Inc
1700 MLK Way
Berkeley, CA 94709
http://www.zapatec.com
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