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Re: stats are way off on 8.4 b1

From: Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: postgres performance list <pgsql-performance(at)postgresql(dot)org>
Subject: Re: stats are way off on 8.4 b1
Date: 2009-04-17 23:34:23
Message-ID: 2f4958ff0904171634t53a6a4a0y913b42e9145eafe5@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
2009/4/18 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
> =?UTF-8?Q?Grzegorz_Ja=C5=9Bkiewicz?= <gryzman(at)gmail(dot)com> writes:
>> That expected 1510 rows in 'assigments' seems to be pretty off,
>
> The planner does not trust an empty table to stay empty.  Every
> Postgres version in living memory has acted like that; it's not
> new to 8.4.

ok, thanks
Quick question Tom. Can correlation be negative ?


-- 
GJ

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