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Oracle Database 10g R2: Administering RAC Sample Questions:

1. In a RAC environment, you see a steep increase for enq:HW- contention and gc current grant wait events. What would you do to fix this issue?

A) Use larger uniform extent sizes for objects.
B) Increase the cache size of sequences.
C) Reduce the time of transactions by committing more often.
D) Reduce the number of updates causing locks on tables accessed by multiple instances.

2. Which three tools can you use to patch your RAC database? (Choose three.)

A) emctl
B) emca
C) dbca
D) EM Database Control
E) opatch
F) Oracle Universal Installer

3. Which two statements about parallel recovery in a RAC environment are true? (Choose two.)

A) The use of the RECOVER Y_PARALLELISM initialization parameter is the only way to initiate parallel recovery.
B) Parallel recovery is most effective at reducing recovery time while concurrently recovering several data files on several disks.
C) The RECOVERY_PARALLELISM initialization parameter specifies the number of redo application server processes participating in instance or media recovery.
D) The RECOVER Y_PARALLELISM initialization parameter causes serial recovery if the value is greater than two.

4. When do you get the first notification after you execute the following command on instance
RDBA1?
execDBMS_SERVER_ALERT.SET_THRESHOLD(-
METRICSJD => dbms_server_alert.elapsed_time_per_call,
WARNINGJDPERATOR => dbms_server_alert.operator_ge,
WARNING_VALUE => 500000',
CRITICAL_OPERATOR => dbms_server_alert.operator_ge,
CRITICAL_VALUE => 750000',
OBSERVATION_PERIOD => 15,
CONSECUTIVEJDCCURRENCES => 3,
INSTANCE_NAME => 'RDBA1',
OBJECT_TYPE => dbms_server_alert.object_type_service,
OBJECT_NAME =>'ERP");

A) when the average elapsed time per call for the ERP service over a 15-minute period exceeds
0.75 seconds three consecutive times
B) when the average elapsed time per call for the ERP service over a 45-minute period exceeds
0.75 seconds
C) when the average elapsed time per call for the ERP service over a 45-minute period exceeds
0.5 seconds
D) when the average elapsed time per call for the ERP service over a 15-minute period exceeds
0.5 seconds three consecutive times

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

Solutions: