Manolo _ <mac_man2005(at)hotmail(dot)it> writes:
> I would like to store the "address on tape" of the first and the last tuple for the run I'm currently creating on a specific tape.
> I need it in order to access directly to those two tuples right after terminating the creation of that specific run.
Why don't you just hold those two tuples in memory (ie, track the first
and latest-so-far tuples of each run)?
regards, tom lane