Would it be possible to offer an option for the OID column to get its value
from an int4 primary key (settable on a per table basis maybe)?
- Stuart
> -----Original Message-----
> From: Hiroshi Inoue [SMTP:Inoue@tpf.co.jp]
> Sent: Saturday, July 21, 2001 7:31 AM
> To: Zeugswetter Andreas SB
> Cc: PostgreSQL-development
> Subject: RE: OID wraparound (was Re: pg_depend)
>
> > -----Original Message-----
> > Zeugswetter Andreas SB
> >
> > > As I mentioned already I'm implementing updatable cursors
> > > in ODBC and have half done it. If OIDs would be optional
> > > my trial loses its validity but I would never try another
> > > implementation.
> >
> > But how can you do that ? The oid index is only created by
> > the dba for specific tables, thus your update would do an update
> > with a where restriction, that is not indexed.
> > This would be darn slow, no ?
> >
>
> Please look at my another(previous ?) posting to pgsql-hackers.
> I would use both TIDs and OIDs, TIDs for fast access, OIDs
> for identification.
>
> > How about instead selecting the primary key and one of the tid's
> > (I never remember which, was it ctid ?) instead, so you can validate
> > when a row changed between the select and the update ?
> >
>
> Xmin is also available for row-versioning. But now I'm wondering
> if TID/xmin are guranteed to keep such characteriscs.
> Even Object IDentifier is about to lose the existence.
> Probably all-purpose application mustn't use system columns
> at all though I've never heard of it in other dbms-s.
>
> regards,
> Hiroshi Inoue