Transactions 2004-05-25 - By sankara rao
Back
Ashutosh Bhardwaj wrote:
> Can somebody throw some lighty on local and global transactions ? what
> are shareable and unsahreable connections?
Local Vs. Global Transactions:
Local transaction scope is limited to a single process (JVM) and may involve at
most one non XA resources (for example: normal JDBC connection
obtained from datasource). Local transaction semantics are normally achieved
through resource specific protocol (for exaple, when JDBC connection is
used, Connection.setAutoCommit and Connection.commit or Connection.rollback can
be used to achieve transactional semantics).
Global transaction scope can span more than one process (one or more JVMs) and
multiple XA resource might involve in the transaction (for example, in
the same transaction, JMS and JDBC resources can be used). Global transaction
semantics are achieved through XA protocol.
shareable and unshareable connections:
With in the transaction, potentially you could share connections and it
will improve the performance. But in some cases, from the application
point of view, connections should not be shared (for example, different
isolation levels are required). J2EE has provision to configure a resource
either shareable or unshareable in the deployment descriptors.
regards
sankar
>
> regards,
> ashutosh
> ===========================================================================
> To unsubscribe, send email to listserv@(protected) and include in the
> body of the message "signoff J2EE-INTEREST". For general help, send
> email to listserv@(protected) and include in the body of the message
> "help".
>
--
Every great movement must experience three stages:
ridicule, discussion, adoption.
-- John Stuart Mill
===========================================================================
To unsubscribe, send email to listserv@(protected) and include in the body
of the message "signoff J2EE-INTEREST". For general help, send email to
listserv@(protected) and include in the body of the message "help".
|
|
