Thanks to Jim, Tibo and Dave for the responses.
The reason I brought this up was I was playing with
implementations of Ed Roman's performance tips (see
http://theserverside.com/resources/patterns_optimizations_roman.pdf).
In this presentation, Ed indicated you could optimize
our redundant database loads by checking in ejbLoad
for whether the database is shared with another
application. If not, then you are free to not reload
the object (assuming of course it is not the first
ejbLoad call since ejbActivate).
Well from your esteemed answers to my original question
I have to conclude that this is a dangerous performance
enhancement. If one bean instance is caching the
data and has properly written it at the end of a
transaction, then the second would never see the
update.
The performance enhancement could still work for
read-only beans.
> ----- Original Message -----
> From: "Dupont, Dennis" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, August 15, 2000 12:50 PM
> Subject: Is there a guarantee of uniqueness for entity beans?
>
>
> > I have looked through the EJB 1.1 spec for a requirement
> > that containers guarantee that entity beans in the ready
> > state are unique (i.e. that there is never more than
> > one instance of a bean with a given primary key value).
> >
> > I cannot find such a guarantee, but I would expect one.
> > Does anyone know if this is indeed the case?
> >
> > Thanks!
> > Dennis Dupont [EMAIL PROTECTED]
> > Quentra Networks (972) 889-5252 (Voice)
> > 2121 N. Glenville (972) 671-2311 (Fax)
> > Richardson, Texas 75082
> >
> >
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> >
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