2 MDBs inserting same row in table

Hi all,
I have a unique requirement.
Environment:
Application is in cluster. I have kept 1 MDB instance on each server. Each MDB listening to same external JMS queue.
A database table row is inserted and one existing is updated by MDBs whenever they receive messages.
Situation:
JMS queue has 2 messages which have same ID value which exists in database.
1st MDB queries table to get existing record from database.
As MDBs are in cluster, 2nd MDB also does same action simultaneously.
As both find old record in database, they insert their data in table.
Thus, each MDB will insert a row in table.
Actually, latest message in queue should get inserted first.
I don't want to lock any database rows.
Is there any design option?
Please let me know suggestions and solutions.
Thanks,
Plad

"prasanna laddha" <[email protected]> wrote in message news:23908280.1098964315854.JavaMail.root@jserv5...
Environment:
Application is in cluster. I have kept 1 MDB instance on each server. Each MDB listening to same external JMS queue.
A database table row is inserted and one existing is updated by MDBs whenever they receive messages.
Situation:
JMS queue has 2 messages which have same ID value which exists in database.
1st MDB queries table to get existing record from database.
As MDBs are in cluster, 2nd MDB also does same action simultaneously.
As both find old record in database, they insert their data in table.
Thus, each MDB will insert a row in table.
Actually, latest message in queue should get inserted first.
I don't want to lock any database rows.
Is there any design option?Dedicate only one cluster node that handles external JMS requests.
Regards,
Slava Imeshev

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