Thomas,
> As a result, I was intending to inflate the value of
> effective_cache_size to closer to the amount of unused RAM on some of
> the machines I admin (once I've verified that they all have a unified
> buffer cache). Is that correct?
Currently, yes. Right now, e_c_s is used just to inform the planner and make
index vs. table scan and join order decisions.
The problem which Simon is bringing up is part of a discussion about doing
*more* with the information supplied by e_c_s. He points out that it's not
really related to the *real* probability of any particular table being
cached. At least, if I'm reading him right.
--
--Josh
Josh Berkus
Aglio Database Solutions
San Francisco
