Re: The Practical Benefits of the Relational Model

"Jan.Hidders" <hidders_at_hcoss.uia.ac.be> wrote in message news:3dafeecb$1_at_news.uia.ac.be...
> >> >At the cost of other users having to wait.
> >>
> >> No, the *illusion* that the other users have to wait. How much the
other
> >> users really have to wait depends upon the locking protocol.
> >
> >And on how trustworthy the other users are.
>
> Not necessarily as much as you seem to claim. How much you depend on that
> depends upon your locking protocol, and for certain optimistic locking
> protocols this is just as much the case as it is in your proposal.

Could you point me in the direction of such protocols?

> So again,
> this not an intrinsic problem in the concept of user visible transaction.
> Moreover, such optimistic protocols are not under all circumstances ideal
> and in some sense your proposal means that this is fixed. So the concept
of
> user visible transaction is in that respect better because it leaves this
> choice open

open to abuse by untrustworthy users

Regards
Paul Vernon
Business Intelligence, IBM Global Services Received on Fri Oct 18 2002 - 19:00:21 CEST