"Benjamin Krajmalnik" <kraj(at)illumen(dot)com> writes:
> I was looking at the files inside my database and came across files
> which have the same OID number as the filename but some had extensions
> (in my case .1 and .2).
You might care to read
http://www.postgresql.org/docs/8.1/static/storage.html
which explains all this.
regards, tom lane