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
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