1Z0-902 PDF FILES, 1Z0-902 RELIABLE EXAM REVIEW

1Z0-902 Pdf Files, 1Z0-902 Reliable Exam Review

1Z0-902 Pdf Files, 1Z0-902 Reliable Exam Review

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Oracle 1z1-902 certification exam covers a wide range of topics related to the implementation of the Oracle Exadata Database Machine X8M. It includes topics such as configuring Exadata database machine hardware and software, implementing Exadata storage server, optimizing database performance, and managing Exadata database machine security.

Oracle Exadata Database Machine X8M is a powerful and efficient platform for running mission-critical database workloads. It is designed to provide high performance, scalability, and reliability for Oracle databases. The Exadata Database Machine X8M is a complete database platform that includes hardware, software, and storage components. It is designed to provide a high-performance, scalable, and reliable platform for running database workloads.

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Oracle Exadata Database Machine X8M Implementation Essentials Sample Questions (Q55-Q60):

NEW QUESTION # 55
You use Enterprise Manager to monitor all the components of your Exadata Database Machine.
Recently, you discovered that certain asmdisks were offline in one of the diskgroups used by the rac database called prod.
In which two sources would you find diagnostic messages related to this problem?

  • A. Enterprise Manager Alerts on the Exadata Storage Server Grid home page
  • B. Enterprise Manager Alerts on the ILOM home page for cell connectivity problems for the prod database instances
  • C. alert logs for Enterprise Manager
  • D. alert logs for the prod database instances
  • E. alert logs for the ASM instances

Answer: A,B


NEW QUESTION # 56
Which are two correct statements about backing up Exadata Database Machine?

  • A. Use a snapshot-based backup of an Oracle Exadata Database Machine database server software.
  • B. Backup of the Oracle Cluster Registry, which also contains Voting Disk information, is automatically maintained on the file system of the first database server.
  • C. For high availability, system area can be on the first two disks and M.2 devices.
  • D. The M.2 disk is hot pluggable and can be replaced when the power is on, but you will have to restore the system data manually.
  • E. Backing up Exadata Storage Server Software is critical for restoration.

Answer: B,D


NEW QUESTION # 57
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. They ensure that the ASM Flex instances are enabled on a maximum of two database servers or VMs per cluster.
  • C. 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.
  • D. Extended Redundancy mirrors data across data centers providing the highest levels of data protection.

Answer: C

Explanation:
Failure groups provide redundancy in Oracle Exadata Database Machine X9M by ensuring that mirror copies of the data are written to different storage servers [1][2]. This prevents the potential for mirror copies to be written to the same server, which would cause a data loss if that server were to experience a physical disk failure. Furthermore, failure groups help to ensure that the ASM Flex instances are enabled on a maximum of two database servers or VMs per cluster, providing an extra layer of data protection. Additionally, Extended Redundancy mirrors data across data centers, providing the highest levels of data protection. Reference: Oracle Exadata Database Machine X9M Implementation Essentials [1][2], Chapter 5: Configuring Oracle ASM.


NEW QUESTION # 58
Your customer needs to ensure that their data is available on the Exadata machine during updates. The customer wants to be able to update one server at a time but still be protected against single-node server failure.
What ASM redundancy level should they use?

  • A. Sparse
  • B. Normal
  • C. External
  • D. High
  • E. Extended

Answer: D

Explanation:
Your customer needs to ensure that their data is available on the Exadata machine during updates. The customer wants to be able to update one server at a time but still be protected against single-node server failure. This means that they need a redundancy level that can tolerate at least one disk failure without losing data availability or performance. Therefore, the best option for them is normal redundancy . Normal redundancy provides two-way mirroring by default, which means that each data extent has a primary copy and a mirror copy on different disks in different failure groups1. A failure group is a subset of disks within a disk group that are likely to fail at the same time due to common dependencies2. On Exadata Database Machine , each Storage Server is considered as a failure group by default2. This means that if one Storage Server fails or needs to be updated , the data on its disks can still be accessed from another Storage Server that has the mirror copies of the same data extents2. Therefore, normal redundancy ensures data availability and performance during updates or single-node server failures.
https://docs.oracle.com/en/engineered-systems/exadata-database-machine/sagug/exadata-administering-asm.html


NEW QUESTION # 59
I/O performance of the prod database on your Exadata Database Machine has degraded slightly over the past month. The database has been allocated to the OLTP I/O Resource Management (IORM) category.
Which two monitoring tools might be useful in examining I/O performance for the prod database?

  • A. OS I/O metrics using Enterprise Manager host pages for the storage servers
  • B. I/O-specific dynamic performance views such as v$iostat_fiie, v$iostat_function, and v$iostat_consumer_group from the prod database instances using SQL *p1us
  • C. OS I/O metrics using OS tools such as iostat on the database servers
  • D. cellcli (or exacli/exadcli) to examine storage server metrics such as database, category, ceiidisk, and griddisk
  • E. OS I/O metrics using OS tools such as iostat on the storage servers

Answer: C,D

Explanation:
The two monitoring tools that might be useful in examining I/O performance for the prod database are:
OS I/O metrics using OS tools such as iostat on the database servers.
cellcli (or exacli/exadcli) to examine storage server metrics such as database, category, ceiidisk, and griddisk.
The Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book states that "I/O metrics can be collected from the database server using OS tools such as iostat [1], as well as from the storage servers using cellcli (or exacli/exadcli) to examine storage server metrics such as database, category, ceiidisk, and griddisk". It also suggests using Enterprise Manager host pages for the storage servers to view OS I/O metrics.


NEW QUESTION # 60
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