On Sun, 2003-12-14 at 18:02, Tom Lane wrote:
> "Matthew T. O'Connor" <matthew@zeut.net> writes:
> > How limiting is the above? Does this mean that pg_upgrade will be
> > rendered invalid if there is an on-disk representation change? Do we
> > think we will make it from 7.4 -> 7.5 without on-disk changes? Do we
> > think at this point most upgrades will be without on-disk changes?
>
> How large N will be in practice remains to be seen, of course, but I'd
> expect something on the order of 4 or 5.
Ok, this is what I was looking for. If we are serious about this, would
it make sense to start a new policy of bumping the major version number
every time an upgrade requires a dump / reload? So PostgreSQL 8.0 would
be the next version with on-disk changes, all the 8.x releases would
have the same on-disk format, and the next time the disk format changes,
then we are on 9.0.