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Oracle Database 10g R2: Administering RAC Sample Questions:

1. You are asked to justify your proposed Maximum Availability Architecture to the IT director who feels that a four-node RAC cluster on the primary should not require a four-node RAC cluster for a physical standby database. The director suggests that either a non-RAC database should be used on the standby or that at most a two-node cluster is all that is required. Your proposed architecture was designed for both planned and unplanned downtime and for performance and scalability of services for all eventualities. How would you justify your proposal? (Choose two.)

A) The four-node physical standby database provides for continuous availability of services but the two-node RAC physical standby database does not.
B) A two-node physical standby would not allow as many services to be supported as a four-node physical standby does in case of a failover to the physical standby.
C) Asymmetric configurations prevent the standby from issuing a FLASHBACK DATABASE command if required after a failover.
D) A non-RAC physical standby would not provide for high availability in the case of a lights out failover to the standby.
E) The four-node physical standby provides for the same service preferences and performance profile in case of a failover to the physical standby database.

2. For which two server metrics can you define thresholds for your services? (Choose two.)

A) CPU_TIME_PER_CALL
B) PHYSICAL_READ_PER_CALL
C) ELAPSED_TIME_PER_CALL
D) APPLICATION_WAIT_TIME
E) SQL EXECUTE ELAPSED TIME
F) LOGICAL_READ_PER_CALL

3. Your company requires that certain database systems be made continuously available because there are revenue-earning applications using Oracle databases. You already use RAC; it is a requirement for the applications to have continuous read and write access to all schema objects in the database during routine DBA maintenance activities. Which three technologies would you recommend for minimizing planned downtime for the application caused by unavailability of data due to those activities? (Choose three.)

A) Fast Start Fault Recovery
B) Bigfile Tablespaces
C) Rolling Release Upgrades
D) Online Index Rebuild
E) Online Table Redefinition
F) Hardware-Assisted Resilient Data

4. Which two statements regarding Oracle Clusterware are correct? (Choose two.)

A) The Oracle Database 10g version of the srvConfig.loc file is the ocr.loc file.
B) The Oracle Database 10g CRS stack is compatible with Oracle 9i Group Services (GSD) processes.
C) The Oracle9i srvConfig.loc file still exists for backward compatibility in Oracle Database 10g.
D) The installation of Oracle Clusterware is not necessary if you have already installed vendor-specific clusterware.

5. Over a six-month period, you have been regularly monitoring your four-instance RAC database,
which is running on the first 4 nodes of a 6-node cluster, by using ADDM and by monitoring well-
known combinations of wait event and statistics in AWR reports.
Two weeks ago, a newer version of your main application went live. Starting last week, you
noticed a large increase in CPU time (consumed by the three application services on your RAC
database) due to increased workload.
The OLTP and DSS services have not had a decrease in the percentage of time spent using CPU.
However, for the BATCH service the percentage of time spent using CPU has gone down and the
wait-time percentage has increased.
You want to recommend a tuning exercise to your team. Which two recommendations would you
make first, based on the symptoms described? (Choose two.)

A) The OLTP and DSS service programs may scale well and could benefit from adding new database instances on either node 5 or 6, or on both.
B) Tune SQL from the BATCH service programs because they may benefit from SQL tuning.
C) The BATCH service programs may scale well and could benefit from adding new database instances on either node 5 or 6, or on both.
D) The OLTP and DSS service programs may scale well and could benefit from adding new database instances on one or both of nodes 5 and 6, and by adding more nodes the SQL for BATCH service programs would perform better due to more CPU power.
E) Tune SQL for the OLTP and DSS service programs because they may benefit from SQL tuning.

Solutions: