Re: Random Page Cost and Planner

Hi, Alexey.

Is it necessary to get the data as far as 1900 all the time ? Maybe there is
> a possibility to aggregate results from the past years if they are constant.
>

This I have done. I created another table (station_category) that associates
stations with when they started to take measurements and when they stopped
(based on the data in the measurement table). For example:

station_id; category_id; taken_start; taken_end
1;4;"1984-07-01";"1996-11-30"
1;5;"1984-07-01";"1996-11-30"
1;6;"1984-07-01";"1996-11-10"
1;7;"1984-07-01";"1996-10-31"

This means that station 1 has data for categories 4 through 7. The
measurement table returns 3865 rows for station 1 and category 7 (this uses
an index and took 7 seconds cold):

station_id; taken; amount
1;"1984-07-01";0.00
1;"1984-07-02";0.00
1;"1984-07-03";0.00
1;"1984-07-04";0.00

The station_category table is basically another index.

Would explicitly sorting the measurement table (273M rows) by station then
by date help?

Dave