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Oracle Database 10g R2: Administering RAC Sample Questions:

1. Which four statements contain accurate information regarding RAC VIPs and application VIPs? (Choose four.)

A) An application VIP fails over if the associated application fails over.
B) It is not recommended to share a RAC VIP among several database instances.
C) A failed over RAC VIP does accept new connections.
D) It is recommended to share application VIPs among multiple applications.
E) A RAC VIP fails over if the listener fails.
F) A failed over application VIP does accept new connections.
G) It is recommended to share a RAC VIP among several database instances.
H) It is not recommended to share an application VIP among several applications.

2. Which two statements are true in any RAC environment? (Choose two.)

A) After your redo threads are defined, you cannot add new ones.
B) A redo thread must contain at least two groups of redo log files before it can be enabled.
C) A publicly enabled thread can be used by any instance of your RAC database.
D) A RAC database must contain at most one redo thread for each instance.
E) A RAC database must contain at least two threads of redo log files per instance.

3. You are preparing to create a RAC cluster. You review the RAC requirements for UNDO tablespaces. Which three are valid statements? (Choose three.

A) If no UNDO tablespace is available when the instance starts, the instance stores undo records in the SYSTEM rollback segments.
B) ALTER DATABASE SET UNDO_TABLEPACE=undotbs3 SID='RDBD01'; is correct.
C) You cannot assign a specific UNDO tablespace to a specific instance.
D) ALTER SYSTEM SET UNDO_TABLESPACE=undotbs3 SID='RDBD01'; is correct.
E) It is not necessary to assign a specific UNDO tablespace to a specific instance.

4. You have a four-node cluster with instances RDBD1, RDBD2, RDBD3, and RDBD4. While evaluating statspack reports, you find nq: TX- index contention on page one under the category op 5 Timed Events.
Further study finds an unusually high number of c buffer busy waits in the Wait Events section.
Checking the Instance Activity Stats section, you see an unusually high value for eaf Node Splits.
Using v$segment_statistics, you identify that the top segment with c buffer busy waits is the index products_pk, which obtains the primary key from a sequence. You wish to present alternative solutions to the team to help reduce contention.
Which three actions would you recommend to reduce the overheads? (Choose three.)

A) Encourage shorter transactions.
B) Set _lm_msg_batch_size to a higher value.
C) Re-create the table using a natural key instead of a surrogate key.
D) Set fast_start_mttr_target to a higher value.
E) Re-create the index as a global hash partitioned index.
F) Increase the sequence cache size if retaining the sequence.

5. View the Exhibit.
Users complain about the performance of an Oracle database-based application. You are requested to investigate. From Grid Control, you immediately infer that one of the cluster database instances is currently unavailable. You also notice that the host where the instance belongs was recently rebooted due to an unknown reason.
Using Grid Control, you restart the instance and performance rapidly improves. You want to determine the cause of the instance startup failure after the system reboot, and you check the resource profiles on both the database and ASM instances involved.
Why was the instance not started by CRS?

A) The database instance's autostart attribute indicates that CRS should not restart it after system boot.
B) The instance was not started by CRS because its target state was set to "offline" before the system was rebooted.
C) The instance was started by CRS but due to multiple instance failures CRS disabled the database instance, thereby preventing further restarts.
D) The instance was started by CRS after the system was rebooted, but someone stopped it from within SQL*Plus.
E) The instance could not be started by CRS because this instance depends on an ASM instance, which has its autostart attribute set to a value, thereby preventing CRS from starting this ASM instance after a system reboot.

Solutions: