Although you are access the same database (resource) you will still need application
servers that support two-phase commit (2PC) in order to execute operations
across servers within a single transaction. The this is required because you are
using two separate connections to the database that would otherwise be unaware of
each other. You need to 2PC to inform the database that these two database
connections are working together within the same transaction.
It's feasible that a vendor could provide connection sharing through some type of
database gateway -- that would eliminate the need for 2PC -- but I'm not aware of
one that does this.
Richard
--
Richard Monson-Haefel
Author of Enterprise JavaBeans, 2nd Edition (O'Reilly 2000)
Co-Author of Java Message Service (O'Reilly 2000)
http://www.EjbNow.com
"Maliyackel, Anup Kumar (CTS)" wrote:
> hi
>
> I have read that when developinng J2ee applications using two app servers or
> two databases, the two phase commit protocol is necessary to maintain data
> consistency.
>
> If I am using two app servers , but writing to the same database how
> important is this?
>
> Regards
> Anup
>
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