On Fri, Dec 6, 2013 at 5:02 AM, Etsuro Fujita
<fujita.ets...@lab.ntt.co.jp> wrote:
> Though at first I agreed on this, while working on this I start to think 
> information about (2) is enough for tuning work_mem.  Here are examples using 
> a version under development, where "Bitmap Memory Usage" means (peak) memory 
> space used by a TIDBitmap, and "Desired" means the memory required to 
> guarantee non-lossy storage of a TID set, which is shown only when the 
> TIDBitmap has been lossified.  (work_mem = 1MB.)

I'd be wary of showing a desired value unless it's highly likely to be accurate.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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