Bruce Momjian <bruce@momjian.us> 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
