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Oracle 1Z0-048 Exam Syllabus Topics:

Oracle Database 10g R2: Administering RAC Sample Questions:

1. 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 and one of the cluster ASM instances are currently unavailable. You also see 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 system boot, 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 autostart attribute is set to a value, thus preventing CRS from starting it after a system reboot.
B) The instance was started by CRS after the system was rebooted, but someone stopped it from within SQL*Plus.
C) The instance was not started by CRS because its target state was set to "offline" a while before the system was rebooted.
D) The instance was started by CRS but due to multiple instance failures CRS disabled the database instance, thereby preventing further restarts.
E) The database instance could not be started by CRS because this instance depends on an ASM instance, whose autostart attribute indicates that CRS should not start this ASM instance after system boot.

2. View the Exhibit.

A Symmetric RAC and Physical Standby Database configuration is set up for a high availability requirement matching the one in the exhibit with the primary using 'maximum availability' protection mode.
Which two benefits are there for each primary instance in sending its redo to a corresponding standby instance, rather than having all the primary instances sending redo to the same standby apply instance? (Choose two.)

A) The services on the primary would be symmetric allowing performance on each instance to be equal in the event of a switchover or failover to the standby database.
B) Multiple standby instances allow the redo to be written to standby redo logs more quickly than just using a single receiving instance by reducing commit time on the primary instances.
C) If the redo receive load is spread across multiple receiving instances then the primary redo transport is less likely to become a bottleneck.
D) Multiple standby instances allow the redo to be applied more quickly by the standby apply instance after the redo has already arrived from the primary.
E) The workloads of the archive processes on the standby instances would be balanced, thereby allowing load balancing across the cluster where the standby resides.

3. 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) Increase the sequence cache size if retaining the sequence.
D) Re-create the table using a natural key instead of a surrogate key.
E) Re-create the index as a global hash partitioned index.
F) Encourage shorter transactions.

4. Your company has certain standard practices for technology and you are configuring ASM disk groups for your four-node RAC cluster. The company guidelines suggest that there is one disk group for the flash recovery area that is shared by all databases and a separate disk group for the database area of all databases. Which three exceptions exist that may require you to create additional disk groups? (Choose three.)

A) The retention policy for backups are different for different databases.
B) There are partitioned tables where the older partitions are in read-only tablespaces and seldom accessed, but the more recent partitions are frequently accessed.
C) The disk farm has different disk models with different characteristics and ages.
D) There are large nonpartitioned tables accessed frequently using indexes.
E) Some databases operate in ARCHIVELOGMODE and others in NOARCHIVELOGMODE.
F) Applications using the databases have different Service-Level Agreements for response time and throughput.
G) Some database instances are shut down every night while others are always running.

5. Which three types of events can you trap using server-side callouts? (Choose three.)

A) DB Console down
B) Oracle instance up
C) Listener down
D) Service member down
E) Shadow application service up
F) EM Agent down
G) Service cardinality low

Solutions: