Bruce Momjian <> writes:
> Uh, not sure how pg_upgrade would detect that as the version number is
> not stored in pg_controldata, e.g.:

>       Data page checksums:                  enabled/disabled

That seems pretty shortsighted.  The field probably ought to be defined
as containing a checksum algorithm ID number, not a boolean.

But having said that, I'm not sure why this would be pg_upgrade's
problem.  By definition, we do not want pg_upgrade running around
looking at individual data pages.  Therefore, whatever we might do
about checksum algorithm changes would have to be something that can be
managed on-the-fly by the newer server.

                        regards, tom lane

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