On Thu, Apr 17, 2014 at 4:48 PM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
> Although I will add that not caching highly useful inner pages for the
> medium term, because that index isn't being used at all for 5 minutes
> probably is very bad. Using the 4,828 buffers that it would take to
> store all the inner pages (as in my large primary index example) to go
> store something else is probably penny wise and pound foolish.
But there could easily be 20 unused indexes for every 1 index that is
being used.