Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp> writes:
> I don't think it's preferable either. However there's
> no problem unless there's an application which handle
> the tuples containing the t_ctid link.
What about READ COMMITTED mode? EvalPlanQual uses the t_ctid field
to find the updated version of the row. If the t_ctid is wrong,
you might get an elog(), or you might miss the row you should have
updated, or possibly you might update a row that you shouldn't have.
regards, tom lane