Re: [PATCHES] [HACKERS] ARC Memory Usage analysis

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