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.

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