> I'm not sure it's cheap. What you suggest would result in a substantial
> increase in clog accesses, which means (1) more I/O and (2) more
> contention. Certainly it's worth experimenting with, but it's no
> guaranteed win.
It seems like there's a number of issues we could fix by making the CLOG
more efficient somehow -- from the elimination of hint bits to the
ability to freeze pages without writing them.
Not, of course, that I have any idea how to do that.
-- -- Josh Berkus PostgreSQL Experts Inc.
http://www.pgexperts.com