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Re: Postgresql 8.3 statistic stadistinct value dead wrong even with default_statistics_target=1000

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To: Maxim Boguk <mboguk@xxxxxxxxxxxxx>
Subject: Re: Postgresql 8.3 statistic stadistinct value dead wrong even with default_statistics_target=1000
From: Tom Lane <tgl@xxxxxxxxxxxxx>
Date: Fri, 22 Aug 2008 11:37:35 -0400
Cc: pgsql-general@xxxxxxxxxxxxxx
Comments: In-reply-to Maxim Boguk <mboguk@xxxxxxxxxxxxx> message dated "Fri, 22 Aug 2008 14:49:32 +0400"
In-reply-to: <48AE99BC.2090008@xxxxxxxxxxxxx>

Maxim Boguk <mboguk@xxxxxxxxxxxxx> writes:
> [ ndistinct estimates way off ]

Estimating the number of distinct values in a distribution with a long
tail is just a really hard problem :-(

			regards, tom lane

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  - From: Maxim Boguk

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