Actually in Oracle 8 rowid is unique within a tablespace. It is possible to
have the same rowid in different tablespaces. This is a change from Oracle
7 and why the rowid changed. This is so they could have adatabase up to a
total of 50 petabytes in size.
Jim
<pku12345_at_my-deja.com> wrote in message news:8rj6a2$3nu$1_at_nnrp1.deja.com...
> By definition, a rowid identifies the storage location of a row within
> a datafile/extent/block. Since no two rows (from the same table or
> otherwise) can physically occupy the same space, rowids are unique
> through out a given database. I don't know why your last query didn't
> work though -- curious....
>
> Pei Ku
>
> In article <8rj4am$28m$1_at_nnrp1.deja.com>,
> kal121_at_my-deja.com wrote:
> > I know that rowids are unique within a given table, but are they
unique
> > among tables? I tried to verify this myself, but Oracle wouldn't let
me.
> >
> > (works ok)
> >
> > SQL> select rowid from tab1;
> >
> > ROWID
> > ------------------
> > AAAA5bAAHAAAAFrAAA
> > AAAA5bAAHAAAAFrAAB
> >
> > (does not work)
> >
> > SQL> select rowid from tab1 where rowid in (select rowid from tab2);
> >
> > select rowid from tab1 where rowid in (select rowid from tab2)
> > *
> > ERROR at line 1:
> > ORA-01410: invalid ROWID
> >
> > Sent via Deja.com http://www.deja.com/
> > Before you buy.
> >
>
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
Received on Fri Oct 06 2000 - 09:18:06 CDT
