"Umar Farooq Minhas" <[EMAIL PROTECTED]> writes:
> How can we accrately estimate the "seq_page_fetch" and =
> "random_page_fetch" costs from outside the postgres using for example a =
> C routine.

Use a test case larger than memory.  Repeat many times to average out
noise.  IIRC, when I did the experiments that led to the current
random_page_cost of 4.0, it took about a week before I had numbers I

                        regards, tom lane

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