| From: | "Greg Sabino Mullane" <greg(at)turnstep(dot)com> |
|---|---|
| To: | pgsql-docs(at)postgresql(dot)org |
| Subject: | Re: [PATCHES] Approximate count(*) |
| Date: | 2005-03-25 02:34:14 |
| Message-ID: | 125db1c7753893171b6ef46609035de8@biglumber.com |
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| Lists: | pgsql-docs pgsql-patches |
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David Fetter wrote:
> Please find enclosed a patch that shows how to get a quick
> approximation of count(*) on a table.
You should mention that ANALYZE will also populate reltuples.
To be real anal, you should say pg_catalog.pg_class too. :)
Tom Lane asked:
>> 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?
Well, it already says "approximate", the value-laden word is "good".
Perhaps if that went away...
- --
Greg Sabino Mullane greg(at)turnstep(dot)com
PGP Key: 0x14964AC8 200503242126
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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