Bruce Momjian <pgman@candle.pha.pa.us> writes:
>> There isn't any fundamental reason why we cannot have a pg_upgrade
>> utility; claiming that there is something wrong with how we handle
>> catalog changes misses the point.
> pg_upgrade does work, assuming there are no changes to the index or heap
> file formats.
Does it really work? I had thought that there were some issues
associated with adjusting transaction numbers that couldn't be solved
by pg_upgrade in its present shell-script form; I was anticipating that
pg_upgrade would have to be rewritten as a C program so that it could
get at stuff at the necessary low level. I cannot recall the details
right at the moment though.
> In fact, there was a bug in the
> handling of clog or wal files, but I didn't find out about it until long
> after 7.2 because no one was using it.
This may be what I was recalling. Did you find a bulletproof fix?
regards, tom lane