How can I implement concurrent query to nine database?

[dudoes]

Hi,

I have nine databases, I want to qeury concurrently data from all the nine databases with the same condition. In other hand, I send simultaneously the same query statement to the nine DataBase, not one after one, then I wait for the results, and merge them.

How can I implement it with JBOSS/EJB?

[marc.fleury]

Message Driven Beans will enable you to do parallel queries on EJBs

[dudoes]

Thank you very much.

[dudoes]

Excuse me, I have another question.

Can two MDBs access directly each other,or through some Message Middleware, such as IBM's MQSerials?

In other words, they can access directly the other side when they locate in the same host of a LAN, their communition had better depend on Message Middleware when theirs is through WAN.

Above is correct?
This is my understanding,it is perhaps not exact.

please give me a detail and put right.

Thanks.