In general the memory usage should be minimized as the jms layer already has a memory cache to avoid writing msgs to the persistent store. Only non-persistent msgs that overflow from the cache and persistent msgs hit the db. What needs to be understood is the interaction between the jms cache and persistence layer under different scenarios. How msgs go into and out of the db are a function of the msg producer and consumer behavior. It can be anything from individual addition/delete, massive addition followed by massive deletion, to anything in between.
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