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Oracle Database 10g R2: Administering RAC Sample Questions:

1. Which CREATE SEQUENCE option is the most scalable?

A) NOCACHE NOORDER
B) CACHE NOORDER
C) CACHE ORDER
D) NOCACHE ORDER

2. You are asked by the DBA team leader to consolidate three different Oracle databases, which supported three separate workloads, into one large three-instance RAC database on a three-node cluster. You also need to create a separate service to represent each workload type and support client-side load balancing. The CRM service has two preferred instances, the HR service has two, and the ORDERS service
has only one. Any instance may be used as an vailable instance for any service that is not
specified as a preferred service for that same instance. You decide to create three separate
entries in TNSNAMES.ORA.
Choose three options describing the number of entries you would have in each address list.
(Choose three.)

A) three entries in the address list for the ORDERS service pointing to the listeners on all three nodes
B) one entry for the address list for the ORDERS service for the listeners on the nodes containing the preferred instance for ORDERS
C) two entries for the address list for the CRM service pointing to the listeners on the nodes containing the preferred instances for CRM
D) two entries for the address list for the HR service for the listeners on the nodes containing the preferred instances for HR
E) three entries in the address list for the HR service for the listeners on all three nodes
F) three entries in the address list for the CRM service for the listeners on all three nodes

3. 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) 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.
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) Tune SQL from the BATCH service programs because they may benefit from SQL tuning.
E) Tune SQL for the OLTP and DSS service programs because they may benefit from SQL tuning.

4. James works as a senior DBA for a finance company. He plans to implement a test RAC
environment. As per his plan, a three-node RAC would be implemented on a Windows platform,
with the following points related to the storage of files:
1) A single Oracle home would be shared by all the nodes.
2) The data files will extend automatically because the autoextend feature will be enabled.
3) The Oracle binaries and all the database files would be stored in a single file system.
4) The hardware RAID is used to support high availability.
These are the some of the storage options available for RAC implementation:
Option 1:Use OCFS with ASM Option 2:Use ASM and not OCFS Option 3:Use OCFS and not ASM Option 4:Use neither OCFS, nor ASM
Which storage option would you suggest for this plan?

A) Option 2
B) either Option 1 or Option 2
C) Option 4
D) either Option 2 or Option 4
E) Option 1
F) Option 3

5. You execute the following command from the first node of your cluster: crsctl add ess votedisk /dev/raw/raw9
However, you get an error message indicating that Oracle Clusterware stack is not started. Which command would you execute?

A) crsctl enable crs Crsctl add ess votedisk /dev/raw/raw9
B) crsctl start crs Crsctl add ess votedisk /dev/raw/raw9
C) crsctl start crs Crsctl add ess votedisk /dev/raw/raw9 -force
D) crsctl enable crs Crsctl add ess votedisk /dev/raw/raw9 -force
E) crsctl add ess votedisk /dev/raw/raw9 -force

Solutions: