HeuristicHazard within a transaction using only one DataSource

We have an ejb 2.0 application running under WL 7.0 SP1. Its CMP beans are
          persisted in two Oracle 9i databases, some beans from different databases
          are related (have CMR). We are using XA Oracle JDriver for both pools.
          The javax.transaction.HeuristicMixedException exception occurred when the
          client application called getId() method on the local interface of one of
          the beans. The client is a webapp deployed together with the ejbs in the one
          EAR.
          The mentioned bean doesn't have any CMR with any bean from the other
          database, and its transaction attribute is 'Required'. Therefore method call
          which resulted in HeuristicMixedException was using only one DataSource. Why
          did exception happened?
          

No.
There is a very slight increase in performance if you have two chips of the same size, but it is something that will only really show up in benchmarks.
Get 1GB now and leave the other 256MB chip in there. When you have an extra $80 around doing nothing, grab another stick.

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