How should the random_page_cost be calculated?
If our disk system does sustained sequential reads at 400MBps, a
sequential page fetch will take 0.02ms.
If the read seek time is 4ms, does this mean that the random_page_cost
is 200 (4/0.02)?
Or should we use the track-to-track seek time of 0.6ms, which would give
a random_page_cost of 30?
Or something else?
Barry Geipel
(barry(at)GeipelNet(dot)com)