"Marc G. Fournier" <scrappy@postgresql.org> writes:
> Hrmmm ... how about if I pg_dump --oids pg_class, make the modes and then
> reload it as opg_class, shut down the database server and move opg_class
> over pg_class, after making the required modifications to opg_class?
Good idea. Give it a shot. Don't forget you'll need to REINDEX pg_class.
regards, tom lane