"Ed L." <pgsql@bluepolka.net> writes:
> I'm getting the following warning on 8.0beta3:
> WARNING: group with ID 103 does not exist
> It is true that I don't have a pg_group.grosysid = 103,
> but I don't understand why the backend expects it in the
> first place.
Probably because you had such a group, and dropped it without first
dropping all the permissions it had. "\z measurement_error" will
likely show a reference to that group.
regards, tom lane