Re: 7.2.1 optimises very badly against 7.2

"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