On Wed, May 18, 2016 at 6:25 AM, Andres Freund <and...@anarazel.de> wrote:
> currently we IIRC use linearly sorted datums for the search in
> individual btree nodes.  Not surprisingly that's often one of the
> dominant entries in profiles. We could probably improve upon that by
> using an order more optimized for efficient binary search.

Did you ever try running a pgbench SELECT benchmark, having modified
things such that all PKs are on columns that are not of type
int4/int8, but rather are of type numeric? It's an interesting
experiment, that I've been meaning to re-run on a big box.

Obviously this will be slower than an equivalent plain pgbench SELECT,
but the difference may be smaller than you expect.

Peter Geoghegan

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