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.

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