| From: | David Fetter <david(at)fetter(dot)org> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PostgreSQL Docs <pgsql-docs(at)postgresql(dot)org>, PostgreSQL Patches <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: [PATCHES] Approximate count(*) |
| Date: | 2005-03-24 17:58:27 |
| Message-ID: | 20050324175827.GC15848@fetter.org |
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| Thread: | |
| Lists: | pgsql-docs pgsql-patches |
On Thu, Mar 24, 2005 at 12:34:51PM -0500, Tom Lane wrote:
> David Fetter <david(at)fetter(dot)org> writes:
> > Please find enclosed a patch that shows how to get a quick
> > approximation of count(*) on a table.
>
> I'm not sure we should be encouraging people to look at reltuples...
> for one thing, it's deliberately a moving average under 8.0.
Should there be more caveats?
Cheers,
D
--
David Fetter david(at)fetter(dot)org http://fetter.org/
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