Re: 7.2.1 optimises very badly against 7.2 - Mailing list pgsql-general

From Tom Lane
Subject Re: 7.2.1 optimises very badly against 7.2
Date
Msg-id 9073.1026480049@sss.pgh.pa.us
Whole thread Raw
In response to Re: 7.2.1 optimises very badly against 7.2  ("Sam Liddicott" <sam.liddicott@ananova.com>)
Responses Re: 7.2.1 optimises very badly against 7.2
List pgsql-general
"Sam Liddicott" <sam.liddicott@ananova.com> writes:
> Do you feel the random page cost of 3 is good to solve this?

For the moment, anyway.  There have been a couple of rounds of
pgsql-hackers discussion about whether to lower the default value of
random_page_cost, but so far no one has done any experiments that
would be needed to establish a good new value.  (The current default
of 4.0 is based on some old experiments I did.  I'm quite willing to
accept that those experiments might have been flawed, but not willing
to replace the number without seeing better experiments...)

            regards, tom lane

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