Exam Name: Oracle Database 10g R2: Administering RAC
Certification Provider: Oracle
Corresponding Certification: Other Oracle Certification
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Oracle 1Z0-048 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Installation and Configuration | - Installing Oracle Clusterware - Preparing RAC environment - Installing RAC database software |
| Topic 2: High Availability Concepts | - RAC recovery scenarios - Failover mechanisms |
| Topic 3: Performance and Tuning | - Load balancing and failover - Troubleshooting performance issues - Monitoring RAC performance |
| Topic 4: Cluster and Database Administration | - Backup and recovery in RAC - Services configuration and management - Managing RAC instances |
| Topic 5: Oracle RAC Architecture | - Cluster fundamentals and components - Shared storage concepts - Cache Fusion and interconnect communication |
Oracle Database 10g R2: Administering RAC Sample Questions:
After a power failure, you noticed that one of your cluster database instances did not start automatically, whereas all other instances came up successfully. What would you do to determine the precise cause for the instance startup failure? (Choose three.)
- A. Enable extra debugging in the Oracle Clusterware software by using the CRSCTL command.
- B. Reboot the node where the failing instance resides to check if the problem is persistent.
- C. Check the alert.log file that belongs to the instance that did not start.
- D. Check for OCR corruptions by using the OCRCHECK command.
- E. Check the alert.log file that belongs to the Oracle Clusterware software.
- F. Check the resource state by using the CRS_STAT command.
- G. Check if the Oracle Clusterware is functional by using the CRSCTL command.
Correct Answer: C,E,F 🗳️
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 instance was started by CRS but due to multiple instance failures CRS disabled the database instance, thereby preventing further restarts.
- B. 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.
- C. The instance was not started by CRS because its target state was set to "offline" before the system was rebooted.
- D. The instance was started by CRS after the system was rebooted, but someone stopped it from within SQL*Plus.
- E. The database instance's autostart attribute indicates that CRS should not restart it after system boot.
Correct Answer: E 🗳️
Which three statements regarding backup of the voting disk are true? (Choose three.)
- A. A backup of the voting disk should be taken whenever a new node is added to the cluster.
- B. On UNIX platforms, the voting disk can be backed up with the dd command.
- C. A backup of the voting disk should be taken whenever an existing node is removed from the cluster.
- D. Whenever a voting disk backup is made, the Clusterware software should be stopped on all nodes in the cluster.
- E. A backup of the voting disk should be taken whenever an RMAN catalog reset is done.
Correct Answer: A,B,C 🗳️
You have attended a user group presentation on RAC and based on what you have learned you feel that your company would benefit from having the RAC option to meet its Oracle database requirements in several ways. Your manager does not know much about RAC and asks you to create a presentation to the team explaining RAC, and whether it should be implemented in your installation. Which three statements explain the benefits and implications of RAC? (Choose three.)
- A. RAC alone would not help protect from human errors.
- B. RAC used in conjunction with parallel execution may provide for speedup of OLTP workload processes.
- C. RAC would increase availability in the event of data failures.
- D. RAC would increase availability in the event of node and instance failures.
- E. RAC alone would increase availability when doing release upgrades.
- F. RAC used in conjunction with parallel execution may provide speedup of DSS queries.
- G. RAC would increase scalability for all application workloads in all cases.
- H. RAC would increase availability in the event of a network failure.
Correct Answer: A,D,F 🗳️
You are asked to investigate a problem regarding client connectivity between the HR service and a database, which is on a four-node RAC cluster. The HR service has four preferred instances on the RAC cluster. This cluster also supports five other services. Occasionally, a client-connect request for the HR service takes several minutes to connect, whereas the other five services connect within a second or two. Client-side and server-side connection load balancing are used for all the services. Which combination of network settings would explain these symptoms? (Choose two.)
- A. The TNSNAMES. ORA file has an entry for the five other services that use the hostnames for the Virtual IP addresses and all the listeners listen on both the Public and Virtual IP addresses.
- B. The listener on one or more nodes is listening on both the Public IP address and the Virtual IP address, and the HR TNSNAMES entry uses the Virtual IP address.
- C. The TNSNAMES. ORA file has an entry for all six services that uses the host name for the Public IP address and not the Virtual IP address.
- D. The TNSNAMES.ORA file has an entry for the HR service that uses only the host name for the public IP address, and all the listeners listen on both the Public and Virtual IP addresses.
- E. The listener on one or more nodes is listening only on the Virtual IP address and the HR TNSNAMES entry uses the Hostnames for the Virtual IP addresses.
Correct Answer: A,D 🗳️
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