| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | John A Meinel <john(at)arbash-meinel(dot)com> |
| Cc: | Mischa Sandberg <mischa(dot)sandberg(at)telus(dot)net>, Markus Schaber <schabi(at)logix-tt(dot)com>, pgsql-perform <pgsql-performance(at)postgresql(dot)org>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [PERFORM] Bad n_distinct estimation; hacks suggested? |
| Date: | 2005-05-04 00:52:54 |
| Message-ID: | 200505031752.54293.josh@agliodbs.com |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-performance |
John,
> But doesn't an index only sample one column at a time, whereas with
> page-based sampling, you can sample all of the columns at once.
Hmmm. Yeah, we're not currently doing that though. Another good idea ...
--
--Josh
Josh Berkus
Aglio Database Solutions
San Francisco
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