Re: 32/64-bit transaction IDs?

On Saturday March 22 2003 11:29, Tom Lane wrote:
> "Ed L." <pgsql(at)bluepolka(dot)net> writes:
> > Actually, dbmirror does it in a couple of steps, but I think this is
> > the basic idea. So the queued tuple changes are groupable (and thus
> > replayable) by xid and order of queueing. Then the slave gets them in
> > the hopefully-correct order via
> > select ...
> > from queue q
> > where q.xid is in some appropriate range
> > order by xid asc, tuple_id asc;
>
> I think this last part is wrong. It shouldn't be using the xid as part
> of the ordering, only the sequence value.

Why not? How would you replay them on the slave in the same transaction
groupings and order that occurred on the master?