JMS scheduling - help

[inr mohan]

Secnario:

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* MQ --> JMS(MDB) --> Oracle DB *
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The above is the scenario, the data will be read by MQ and MDB will do some processing, then updates the data in to the oracle.

But the restriction here is the DB might go down for 6-7 hours daily, at that time the MDB should not run ( read the message & process it).

Please help me suggesting some design for the above scenario like

1. How to deploy & Undeploy the MDB on timely basis
2. Can I have some scheduler in JMS service

Thanks in Advance
Ayyanar...