Retrieving messages - FIFO when using Correlation ID

Hi,
I've implemented a dbms_pipe clone using AQ (we're using RAC which doesn't support dbms_pipe - long story). Basically I've simulated dbms_pipe message queues by using CorrelationID's.
Unfortunately, it seems that when retrieving a message by CorrelationID, the order is undetermined. It is critical in my scenario that messages are dequeued in the order they were enqueued.
Does anyone have a trick or suggestion to solve my dilemma.
Thanks,
Steve

Thanks for the reply. I should have explained myself a bit better. We had a number of existing apps that were developed using dbms_pipe. When we migrated to 11g RAC, of course everything broke.
So I built a package that provides an identical interface to dbms_pipe but uses dbms_aq under the covers (which is RAC-friendly).
I need to use the CorrelationID because I am implementing multiple 'logical' queues (similar to the dbms_pipe functionality) inside a single AQ queue. Messages are tagged with a CorrelationID which represents the logical queue.
If there are multiple messages for a logical queue, calling the dequeue method with a CorrelationID (logical queue) does not necessarily retrieve the messages in FIFO order. On re-reading the documentation I see this is the expected (but in my case undesirable) behaviour.
I hope this explains my dilemma a bit better :-).
Thanks,
Steve

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Retrieving messages - FIFO when using Correlation ID

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