On 2015-07-28 15:14:11 -0400, Robert Haas wrote:
> On Tue, Jul 28, 2015 at 3:10 PM, Andres Freund <andres@anarazel.de> wrote:
> > DBA creates a database and sets some properties (security labels, gucs,
> > acls) on it. Then goes on to restore a backup. Unfortunately that backup
> > might, or might not, overwrite the properties he configured depending on
> > whether the restored database already contains them and from which
> > version the backup originates.
>
> Well, I think that's just a potential incompatibility between 9.6 and
> previous versions, and a relatively minor one at that. We can't and
> don't guarantee that a dump taken using the 9.3 version of pg_dump
> will restore correctly on any server version except 9.3. It might
> work OK on a newer or older version, but then again it might not.
Even within a single major version it'll be a bit confusing that one
time a restore yielded the desired result (previously set property
survives) and the next restore it doesn't, because now the backup does
contain the property.