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help / color / mirror / Atom feedFrom: Joshua D. Drake <[email protected]>
To: George Pavlov <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: [email protected]
Subject: Re: index vs. seq scan choice?
Date: Thu, 07 Jun 2007 15:01:51 -0700
Message-ID: <[email protected]> (raw)
In-Reply-To: <8C5B026B51B6854CBE88121DBF097A86DEA6B4@ehost010-33.exch010.intermedia.net>
References: <8C5B026B51B6854CBE88121DBF097A86C3A30D@ehost010-33.exch010.intermedia.net>
<[email protected]>
<8C5B026B51B6854CBE88121DBF097A86DEA6B4@ehost010-33.exch010.intermedia.net>
George Pavlov wrote:
>> From: Tom Lane [mailto:[email protected]]
>> "George Pavlov" <[email protected]> writes:
> to 977ms! If I go the other way and SET STATISTICS 1 (or 0) I can bring
> down the list to one entry (setting to 0 seems equivalent and still
> keeps the one most common entry!?) and I will get the Index scan for all
> states except for that one most common state. But, of course, I don't
> want to undermine the whole stats mechanism, I just want the system to
> use the index that is so helpful and brings runtimes down by a factor of
> 4-8! What am I missing here?
In those rare cases wouldn't it make more sense to just set
enable_seqscan to off; run query; set enable_seqscan to on;
??
Joshua D. Drake
>
> George
>
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