Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> I am confused why we can't implement subtransactions as part of our
> command counter? The counter is already 4 bytes long. Couldn't we
> rollback to counter number X-10?
That'd work within your own transaction, but not from outside it.
After you commit, how will other backends know which command-counter
values of your transaction to believe, and which not?
regards, tom lane