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Question 2 : Which WebLogic optimization allows one non-XA resource to participate in a distributed transaction?

A. enabling Pinned to Thread

B. enabling Logging Last Resource

C. increasing the Statement cache size

D. setting the statement cache type to LRU

E. setting the initial and maximum capacity to the same number

Answer: A

Explanation: XA Affinity and Failover When accessed within a global transaction, the member data source from which the JDBC connection was obtained is pinned to the global transaction for the life of the transaction. This ensures that all database operations performed on connections obtained from the Multi Data Source, for a particular transaction, all execute on the same RAC instance. XA affinity results in improved performance and is even a requirement for older versions of RAC, such as prior to 11g. The XA failover is also supported by the Multi Data Source and transaction manager implementations. If a pinned RAC instance suffers a failure, then a global transaction can complete utilizing a different RAC instance using a connection obtained one of the other member data sources.

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