Handling Concurrency in Oracle Service Bus11g

Question

Hi,
I"m searching for how to handle concurrency within OSB.
Scenario: +I've a proxy service which listens to MQ and whenever a message is picked up, it routes it to READProxy service and followed by CREATEProxy service or UPDATEProxy service.+
However, the message rate is ~1000 per hour. So there could be a chance such a way two or more messages can be picked up by LISTENERProxy service at different managed servers at a time.
Could somebody help me how to make sure READProxy service reads right data by considering the nature of concurrency?
Thank you
Edited by: 1002815 on May 2, 2013 10:50 AM

Answer 1

Yes, you're right and this is easy and one of the best strategies..however,
Locking Strategies: --> [http://www.dba-oracle.com/t_locking_strategies.htm]
select for update - This holds an exclusive lock on the target row and is 100% reliable.  The downside is with disconnected session which may require DBA intervention to release the locks.  In general, the "select for update" is not used in web-based systems, or on applications with unreliable network connectivity.
So we tried to implement Timstamp based locking but couldn't succeed as it involves millisecs and requires comparision xml timestamp to oracle timestamp..
Just try to get help with someone who knows PL/SQL in your org or go through some tutorials over internet.Thanks for your suggestion. I can manage to understand the basic level of SQL and PL/SQL
I'm trying to understand whether I missed out any best approach
Thank you
Edited by: 1002815 on May 4, 2013 10:13 AM