>>> Farhan Husain <russ...@gmail.com> wrote: > Thanks a lot Scott! I think that was the problem. I just changed the > default statistics target to 50 and ran explain. The plan changed > and I ran explain analyze. Now it takes a fraction of a second! Yeah, the default of 10 has been too low. In 8.4 it is being raised to 100. > Thanks to all of you who wanted to help me. I would be happy if > someone does me one last favor. I want to know how these query plans > are generated and how the parameters you suggested to change affects > it. If there is any article, paper or book on it please give me the > name or url. In terms of tuning in general, you might start with these: http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server http://www.postgresql.org/docs/8.3/interactive/runtime-config-query.html To understand the mechanics of the optimizer you might be best off downloading the source code and reading through the README files and comments in the source code. -Kevin
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