On Tue, 17 May 2005 22:12:17 -0700, "Jeffrey W. Baker" <jwbaker@acm.org>
wrote:
>Incrementing random_page_cost from 4 (the default) to 5 causes the
>planner to make a better decision.
We have such a low default random_page_cost primarily to mask other
problems in the optimizer, two of which are
. multi-column index correlation
. interpolation between min_IO_Cost and max_IO_cost which approximates
max_IO_cost too fast.
ServusManfred