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From: Tom Lane <[email protected]>
To: Alvaro Herrera <[email protected]>
Cc: George Pavlov <[email protected]>
Cc: [email protected]
Subject: Re: [GENERAL] index vs. seq scan choice?
Date: Thu, 24 May 2007 22:45:17 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <8C5B026B51B6854CBE88121DBF097A86C3A30D@ehost010-33.exch010.intermedia.net>
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Alvaro Herrera <[email protected]> writes:
> Tom Lane wrote:
>> (The default statistics target is 10, which is widely considered too
>> low --- you might find 100 more suitable.)

> Does this mean that we should look into raising the default a bit?

Probably ... the question is to what.

The default of 10 was chosen in our usual spirit of conservatism ---
and IIRC it was replacing code that tracked only *one* most common
value, so it was already a factor of 10 better (and more expensive)
than what was there before.  But subsequent history suggests it's
too small.  I'm not sure I want to vote for another 10x increase by
default, though.

			regards, tom lane

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