On Sat, Oct 6, 2018 at 7:47 AM John Naylor <jcnaylor(at)gmail(dot)com> wrote:
> A while back, Robert Haas noticed that the space taken up by very
> small tables is dominated by the FSM [1]. Tom suggested that we could
> prevent creation of the FSM until the heap has reached a certain
> threshold size [2]. Attached is a WIP patch to implement that. I've
> also attached a SQL script to demonstrate the change in behavior for
> various scenarios.
Hi John,
You'll need to tweak the test in contrib/pageinspect/sql/page.sql,
because it's currently asserting that there is an FSM on a small table
so make check-world fails.
--
Thomas Munro
http://www.enterprisedb.com