Patrick Welche <prlw1(at)newn(dot)cam(dot)ac(dot)uk> writes:
> I think we still recommend using *new* pg_dump to dump *old* server when
> upgrading. If one tries that with today's pg_dump (8.1beta1) against
> a 8.1devel server of 6 May, i.e., predating roles, one gets:
[ shrug... ] The current code is expecting that "8.1" means what it
means today. For dumping from a between-releases snapshot, you'd better
use the pg_dump from the same snapshot.
regards, tom lane