What disk subsystem do you have? Single disks? Raid? Raid with battery buffered write cache?
Last one can improve your performance massively.
-- Matthias
Thanks for your reply.
I have answered your questions below.
1 & 2) System: Microsoft Windows XP Professional
Version 2002
Computer: Intel Pentium CPU 3.40GHz, 960MB of RAM
3) shared_buffers = 20000
autovaccum = on
4) Yes, I am vacuuming & analyzing the database once every day.
5) No concurrent activities, means I run one command at a time.
6) Nothing else running on the box other than Postgres.
I hope these answers will try to solve my problem. Thanks again.
Roopa