Bruce Momjian wrote:
>
> > Tom Lane wrote:
> > So
> > > the thing would act a lot like the original-relname-plus-OID variant
> > > that's been discussed so far. (Original relname because ALTER TABLE
> > > RENAME would *not* change the physical file name. But we could
> > > think about a form of VACUUM that creates a whole new table by
> > > versioning, and that would presumably bring the physical name back
> > > in sync with the logical relname.)
> >
> > At least on UNIX, couldn't you use a hard-link and change the name in
> > pg_class immediately? Let the brain-dead operating systems use the
> > vacuum method.
>
> Yes, we can hard-link, and let vacuum remove the old link.
BTW, how does vacuum know which files are obsolete. Does it just delete
files it doesn't know about?
What a good application for time travel!
