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Re: Bug? 8.0 does not use partial index

From: Palle Girgensohn <girgen(at)pingpong(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, John Hansen <john(at)geeknet(dot)com(dot)au>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Bug? 8.0 does not use partial index
Date: 2005-01-13 22:17:40
Message-ID: 4790DAE91505459D0EC10580@palle.girgensohn.se (view raw or flat)
Thread:
Lists: pgsql-hackers
--On torsdag, januari 13, 2005 17.03.41 -0500 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> 
wrote:

> Palle Girgensohn <girgen(at)pingpong(dot)net> writes:
>> How do you mean they look far off?
>
>>  Seq Scan on group_data  (cost=0.00..47544.43 rows=114164 width=43)
>>  (actual  time=114.015..1334.479 rows=4 loops=1)
>
> 114164 estimated vs 4 actual rows is pretty far off.  Perhaps something
> skewed about the data distribution?

Well, it might seem strange, but it is a quite normal data distribution for 
this application, believe me.


>> If you want, I can send you the data.
>
> If it's not too huge, sure, send it to me off-list.

I'm doing that now.

/Palle


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