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Oracle Exadata Database Machine X8M Implementation Essentials Sample Questions (Q60-Q65):
NEW QUESTION # 60
How do ASM failure groups provide redundancy?
- A. Failure groups contain all ASM disks in a single storage server preventing mirror copies being written to the same storage server.
- B. Extended Redundancy mirrors data across data centers providing the highest levels of data protection.
- C. They ensure that the ASM Flex instances are enabled on a maximum of two database servers or VMs per cluster.
- D. Failure groups are created for each grid disk to ensure mirror copies are written to the same storage server for faster recovery after a physical disk failure.
Answer: A
Explanation:
According to Oracle’s documentation12, ASM failure groups provide redundancy by storing mirror copies of data on different disks or storage servers. When ASM allocates an extent for a normal redundancy file, ASM allocates a primary copy and a secondary copy. ASM chooses the disk on which to store the secondary copy so that it is in a different failure group than the primary copy1. This way, if one disk or storage server fails, ASM can still access the data from another failure group2.
Therefore, the statement that is true about how ASM failure groups provide redundancy is:
Failure groups contain all ASM disks in a single storage server preventing mirror copies being written to the same storage server.
NEW QUESTION # 61
Which two sections of the AWR report shows statistics for X9M Persistent Memory Cache?
- A. PMEM Cache section within Memory Statistics
- B. cell PMEM cache Read Hits in the Database IOs portion of the Performance Summary
- C. PMEM Pool Misses in the Exadata Outlier Summary
- D. PMEM Pool cache Read Hits in the Cache Sizes portion of the Report Summary
- E. PMEM Cache section within Exadata Smart Statistics
Answer: A
NEW QUESTION # 62
Which three of the following options are available for database consolidation on Exadata?
- A. A single database with one or more schema per application
- B. Multiple Databases on a cluster
- C. Multiple Virtual Machine clusters supporting a single database for greatest resource isolation
- D. Multiple databases spanning a Bare Metal and Virtual Machine cluster to provide resource isolation and consolidation concurrently
- E. Bare Metal deployment with one database per database server
- F. Multiple pluggable databases in one or more container databases on a Virtual Machine or Bare Metal cluster
Answer: C,D,F
Explanation:
Options A, D, and F are available for database consolidation on Exadata. Option A refers to the use of multiple pluggable databases in one or more container databases on either a Virtual Machine or Bare Metal cluster. Option D refers to the use of multiple databases spanning a Bare Metal and Virtual Machine cluster to provide resource isolation and consolidation concurrently. And finally, Option F refers to the use of multiple Virtual Machine clusters supporting a single database for greatest resource isolation. This is referenced in the Oracle Exadata Database Machine X9M Implementation Essentials Official Textbook, which is available online at https://docs.oracle.com/cd/E80437_01/E80437/html/index.html.
NEW QUESTION # 63
Which statement is true about the Persistent Memory Commit Accelerator?
- A. Persistent Memory Commit Accelerator tracks changes to Persistent Memory Data Accelerator to ensure duplicate blocks are not written to Flash.
- B. Persistent Memory Commit Accelerator helps to further reduce redo log write latency by using Persistent Memory and Remote Direct Memory Access (RDMA).
- C. Persistent Memory Commit Accelerator reduces redo log write latency by using Persistent Memory and RDMA before flushing to Flash then disk.
- D. Persistent Memory Commit Accelerator contains logging information from all tiers of the software stack for rapid triage and diagnostics.
- E. Persistent Memory Commit Accelerator copies redo log data from disk for faster redo apply on Data Guard Standby Databases.
Answer: C
Explanation:
Persistent Memory Commit Accelerator reduces redo log write latency by using Persistent Memory and RDMA before flushing to Flash then disk. This helps to further reduce redo log write latency by utilizing the speed and low latency of Persistent Memory, along with the Remote Direct Memory Access (RDMA) protocol, to commit changes to disk faster. This allows the system to quickly commit changes to disk, resulting in improved performance and reduced latency.
This is according to the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book and Resources [1][2]. The Persistent Memory Commit Accelerator uses Persistent Memory and Remote Direct Memory Access (RDMA) technology to write redo log data to Flash and disk, resulting in improved latency and higher throughput. Additionally, the Accelerator tracks changes to Persistent Memory Data Accelerator to ensure duplicate blocks are not written to Flash [1], further reducing latency.
NEW QUESTION # 64
Which two statements are correct about adding an additional database server to a physical Exadata X9M Database Machine using Oracle Exadata Deployment Assistant (OEDA)?
- A. It is required to install OEDA on the first new database server.
- B. In order to configure the servers with Oracle Exadata Deployment Assistant (OEDA), the new server information must be entered in OEDA, and the configuration file must contain existing nodes.
- C. Executing /opt/oracle.supportTools/reclaimdisks.sh -free -reclaim on each Exadata X9M Database server is required to reclaim disk space and perform partition reconfiguration.
- D. Do not proceed if the OEDA Validate Configuration File step displays an error message about missing files p6880880.zip.
- E. The applyElasticConfig.sh script performs network configuration for the new servers. The new servers are restarted at the end of the process.
Answer: C,E
Explanation:
The execute /opt/oracle.supportTools/reclaimdisks.sh -free -reclaim on each Exadata X9M Database server is required to reclaim disk space and perform partition reconfiguration.
The applyElasticConfig.sh script performs network configuration for the new servers. The new servers are restarted at the end of the process.
NEW QUESTION # 65
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