On Fri, Oct 26, 2012 at 8:30 AM, Kevin Grittner <kgrittn@mail.com> wrote:
> ktm@rice.edu wrote:
>
>> You have the sequential_page_cost = 1 which is better than or equal
>> to the random_page_cost in all of your examples. It sounds like you
>> need a sequential_page_cost of 5, 10, 20 or more.
>
> The goal should be to set the cost factors so that they model actual
> costs for you workload in your environment.
Unfortunately the random_page_cost is getting multiplied by an
estimated page count which is 4 orders of magnitude too high.
random_page_cost and seq_page_cost (and enable_seqscan) might not be
the right knobs, but they are the knobs that currently exist.
Cheers,
Jeff