A common approach to solve application performance issues is to add more hardware. Which
two reasons describe why this alone does not always solve performance problems?

A. There may be a bottleneck in the application that additional hardware would not solve.
B. Adding more hardware is costly and time consuming.
C. Adding hardware at the application layer may place additional load on an already overloaded
database, network appliance, or storage system.
D. Adding more hardware may introduce new configuration requirements that need to be tested.

Answer(s): A, C
QUESTION: 6
A customer has a critical, performance-sensitive web application that connects to a multinode
Oracle RAC database. Which feature of WebLogic can provide significant performance benefit?

A. The Web Session Affinity feature of Active GridLink for RAC
B. WebLogic Clustering
C. The Transaction Affinity feature of Active GridLink for RAC
D. Coherence*Web Session Replication

Answer(s): C
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.

Reference: Oracle WebLogic Server Active GridLink for Oracle Real Application Clusters(RAC)

QUESTION: 7
A customer needs to implement a Highly Available solution for JMS that has a primary data
center and a backup. Which three steps would you perform when designing your solution?

A. Store Transaction Logs in a database and use Database stores for JMS to make replication
between sites easier.
B. Use file based Transaction Logs and JMS stores and implement a separate replication
solution for files in addition to database in case database replication fails.
C. Implement Oracle RAC at each site to provide a highly available solution within each
datacenter.
D. Configure Whole Server Migration to migrate WebLogic Managed Servers from the primary
to the secondary site.
E. Configure Automatic Service Migration for JMS high availability within a datacenter.
5

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