On 2014-01-01 21:15:46 -0500, Robert Haas wrote:
> [ sensible reasoning ] However, I'm not sure it's really worth it.
> I think what people really care about is knowing whether the bitmap
> lossified or not, and generally how much got lossified. The counts of
> exact and lossy pages are sufficient for that, without anything
> additional
Showing the amount of memory currently required could tell you how soon
accurate bitmap scans will turn into lossy scans though. Which is not a
bad thing to know, some kinds of scans (e.g. tsearch over expression
indexes, postgis) can get ridiculously slow once lossy.
Greetings,
Andres Freund
-- Andres Freund http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training &
Services
