> > 2. locking should be easier if only the original heap page is
involved.
>
> Yes, but multi-page update already happens now, so HOT is not
> different on that point.
I was thinking about the case when you "pull back" a tuple, which seems
to be more
difficult than what we have now.
Andreas
PS: I think it is great that you are doing all this work and explaining
it for us. Thanks.