Joshua D. Drake wrote:
PostgreSQL's defaults are based on extremely small and some would say (non production) size databases. As a matter of course I always recommend bringing seq_page_cost and random_page_cost more in line.
Also, they presume that not all of your data is going to be in memory, and the query optimizer needs to be careful about what it does and doesn't pull from disk. If that's not the case, like here where there's 8GB of RAM and a 7GB database, dramatic reductions to both seq_page_cost and random_page_cost can make sense. Don't be afraid to think lowering below 1.0 is going too far--something more like 0.01 for sequential and 0.02 for random may actually reflect reality here.
-- Greg Smith, 2ndQuadrant US greg@xxxxxxxxxxxxxxx Baltimore, MD PostgreSQL Training, Services and Support www.2ndQuadrant.us Author, "PostgreSQL 9.0 High Performance" Pre-ordering at: https://www.packtpub.com/postgresql-9-0-high-performance/book -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
