On 02/16/2014 09:26 PM, Robert Haas wrote: > I don't really know about cpu_tuple_cost. Kevin's often advocated > raising it, but I haven't heard anyone else advocate for that. I > think we need data points from more people to know whether or not > that's a good idea in general.
In 10 years of tuning PostgreSQL professionally, I still don't have a mathematical model for the interaction of the various *_cost parameters with the speeds of CPU, RAM and IO. If someone else has one, please post it so that we can make some intelligent decisions on defaults. -- Josh Berkus PostgreSQL Experts Inc. http://pgexperts.com -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers