On Fri, 3 Dec 1999 17:23:23 +0530 Nittle Gupta wrote:
> Then which one is better pessimistic or optimistic.Then only we can
> decide for the application server.
Unfortunatelly, I haven't meet with a server which correctly handles
transaction isolation levels. Some servers serialize all requests, no
matter for tr. isol. level set. Others don't lock local entity bean
instances, so the following scenario is possible:
T1 T2
1 begin
2 tb.set($100)
3 begin
4 tb.deposit($10000)
5 commit
6 commit
and the value is $100, because T1 externalizes the bean later than T2.
Marek Prochazka
-----------------------------------------------
Marek Prochazka
Charles University
Faculty of Mathematics and Physics
Department of Software Engineering
Malostranske namesti 25, 118 00 Prague 1
Czech Republic
phone: +420-2-2191 4236
http://nenya.ms.mff.cuni.cz/thegroup/
-----------------------------------------------
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff EJB-INTEREST". For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".
