Oracle CEP 10.3 Event Sink Issue

Hi,
I am use Oracle CEP 10g R3 for filtering RFID events from a ALE Processor. I have written the CEP query "INSERT INTO JMSEvent
               SELECT epcTAG,deviceID,timestamp FROM JMSEvent RETAIN 100 EVENTS WITH UNIQUE epcTAG GROUP BY epcTAG,
               deviceID, timestamp having count(*) >= 0 "
The message onEvent() gets fired mupltiple times for the implemented class of EvenSink. Do I need to enable the Cache or make any necessay changes in the config side to make the query execute only once. Please let me know.
Thanks in advance,
Arijit De

I think it should be out end of this month (June '10).

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