あなたを合格させる試験には100%確認済み1Z0-902試験問題
1Z0-902問題集PDFで1Z0-902リアル試験問題解答
Oracle Exadata Database Machine X8Mは、ハードウェアとソフトウェアの組み合わせを使用して、比類のないパフォーマンスとスケーラビリティを提供する高性能なデータベースシステムです。大規模なデータ処理および分析ワークロードをサポートするように設計されており、企業レベルのアプリケーションの理想的なプラットフォームです。Oracle 1Z0-902認定試験は、ストレージ、ネットワーク、セキュリティ、および管理など、Exadataのコアコンセプトをカバーしており、この最先端の技術に精通するエキスパートになることができます。
質問 # 20
You are hardening the security posture of your Exadata Database Machine. Before disabling ssh access to the storage servers, what should you do to enable REST access to the MS process?
- A. The MS Process on the storage servers is natively endowed with REST services and are enabled by default, however, appropriate roles and users should be created to ensure security.
- B. The MS Process on the storage servers is natively endowed with REST services, but are not enabled by default.
- C. Install Oracle Rest Data Services on each Storage server and install the MS APEX application.
- D. Install Oracle Rest Data Services on each Database server and install the MS APEX application.
正解：B
解説：
To enable REST access to the MS process, you need to manually enable the REST services on each storage server by running the command cellcli -e "ALTER CELL ENABLE REST" and then configure authentication and authorization to ensure secure access. This is described in detail in the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book (Chapter 8, Securing the Exadata Database Machine).
https://docs.oracle.com/en/cloud/paas/exadata-cloud/csexa/access-rest-api.html
質問 # 21
An Exadata storage server physical disk on an X9M-2 high-capacity full rack entered the predictive failure state. Which two steps must you perform to replace this failed physical disk?
- A. Replace the failed physical disk.
- B. Create a new celldisk and new griddisks on the replaced physical disk.
- C. Identify the griddisks located on the failed physical disk and drop them from the associated ASM diskgroups.
- D. Add the griddisks back into the ASM diskgroup they used to be a member of.
- E. Verify that the griddisks located on the physical disk have been successfully dropped from the associated ASM diskgroups.
- F. Rebalance the data on the effected griddisks before performing a manual drop command.
正解：A、F
質問 # 22
What is the maximum DRAM capacity you can expand an X9M-2 DB Server?
- A. 384GB
- B. 1536GB
- C. 2048GB
- D. 768GB
- E. 1024GB
- F. 512GB
正解：E
解説：
According to the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book, the maximum DRAM capacity you can expand an X9M-2 DB Server is 1024GB. This is the maximum amount of DRAM that can be installed in the server. The specific steps for adding DRAM are outlined in the book and can be referenced here: https://docs.oracle.com/cd/E80920_01/E80920/html/x9m_hardware_memory.html.
質問 # 23
Your system administrator reports an amber, non-blinking light on one of your Exadata storage disks. You immediately execute the 'list physicaldisk where diskType=HardDisk and status=failed DETAIL' command on the Exadata storage system and the specified disk is indeed reported as failed. Platinum Support has not been enabled for this system. Enterprise Manager Cloud Control is monitoring the system.
What is the next step that you should perform before you do anything else?
- A. Ask the system administrator to replace the broken disk with a spare.
- B. Wait for a blue light to appear on the disk if the rebalance operation is running.
- C. Check the database to see if any rebalance operations are active.
- D. Download and run the latest exadiag tool.
- E. Call Oracle Support and make an appointment so that the drive can be replaced.
- F. Wait for the email of the failure that Exadata or Enterprise Manager will send.
正解：A
質問 # 24
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. Extended
- B. Normal
- C. External
- D. Sparse
- E. High
正解：E
解説：
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
質問 # 25
For which four component failures on an X9M Database Machine does Auto Service Request (ASR) raise service requests?
- A. Cisco RDMA over Converged Ethernet (RoCE) switches
- B. power distribution units
- C. power supplies in the database servers
- D. fans in the storage servers
- E. RoCE network interface cards in the database servers
- F. Cisco management switch
- G. RoCE network interface cards in the storage servers
正解：B、C、D、G
質問 # 26
Which three of the following options are available for database consolidation on Exadata?
- A. Bare Metal deployment with one database per database server
- B. Multiple pluggable databases in one or more container databases on a Virtual Machine or Bare Metal cluster
- C. Multiple Databases on a cluster
- D. Multiple databases spanning a Bare Metal and Virtual Machine cluster to provide resource isolation and consolidation concurrently
- E. A single database with one or more schema per application
- F. Multiple Virtual Machine clusters supporting a single database for greatest resource isolation
正解：B、C、D
解説：
A Exadata supports multiple pluggable databases in one or more container databases, which enables database consolidation by allowing multiple databases to be consolidated into a single container database. This can be deployed on a Virtual Machine or Bare Metal cluster.
D Multiple databases spanning a Bare Metal and Virtual Machine cluster provide resource isolation and consolidation concurrently. It allows multiple databases to be deployed on both Bare Metal and Virtual Machine clusters, providing isolation and consolidation at the same time.
E Multiple Databases on a cluster allows multiple databases to be deployed on a single cluster, which enables consolidation of databases by reducing the number of clusters required.
質問 # 27
You are providing oversight for the delivery of a new Exadata Database Machine.
1. Stabilize the Exadata Rack.
2. Unpack Oracle Exadata Rack.
3. Review the safety guidelines.
4. Let the Exadata acclimatize for 24 hours.
5. Power on Exadata PDU A.
6. Place Exadata in its allocated space.
7. Power on Exadata PDU B.
What is the correct order of these steps?
- A. 2,6,1,4,3,7,5
- B. 3,2,6,1,4,7,5
- C. 4,3,2,6,1,7,5
- D. 3,2,6,4,1,7,5
- E. 2,3,4,6,1,7,5
正解：E
解説：
This ordering is based on the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book and other resources. First, the Exadata should be stabilized and unpacked (Steps 2 and 3). Then, the safety guidelines should be reviewed (Step 4). The Exadata should then be allowed to acclimatize for 24 hours (Step 4). After that, the Exadata PDU A should be powered on (Step 6) and the Exadata should be placed in its allocated space (Step 6). Finally, the Exadata PDU B should be powered on (Step 7).
質問 # 28
Which dbmcli command is NOT valid on Exadata X9M?
- A. dbmcli -e "LIST IBPORT DETAIL"
- B. dbmcli -e "LIST ALERTHISTORY WHERE agelnMinutes < 15"
- C. dbmcli -e "LIST METRICHISTORY WHERE name LIKE 'DS_.*'"
B) dbmcli -e "LIST METRICCURRENT WHERE name = 'DS_TEMP' "
正解：B
質問 # 29
Which three of the following options are available for database consolidation on Exadata?
- A. Multiple Virtual Machine clusters supporting a single database for greatest resource isolation
- B. Bare Metal deployment with one database per database server
- C. Multiple pluggable databases in one or more container databases on a Virtual Machine or Bare Metal cluster
- D. Multiple databases spanning a Bare Metal and Virtual Machine cluster to provide resource isolation and consolidation concurrently
- E. Multiple Databases on a cluster
- F. A single database with one or more schema per application
正解：A、C、E
質問 # 30
Which three of the following options are available for database consolidation on Exadata?
- A. Bare Metal deployment with one database per database server
- B. Multiple pluggable databases in one or more container databases on a Virtual Machine or Bare Metal cluster
- C. A single database with one or more schema per application
- D. Multiple databases spanning a Bare Metal and Virtual Machine cluster to provide resource isolation and consolidation concurrently
- E. Multiple Databases on a cluster
- F. Multiple Virtual Machine clusters supporting a single database for greatest resource isolation
正解：B、C、E
解説：
According to Oracle.com documents or resources, the three options that are available for database consolidation on Exadata are:
A) Multiple pluggable databases in one or more container databases on a Virtual Machine or Bare Metal cluster123.
C) A single database with one or more schema per application12.
E) Multiple Databases on a cluster12.
https://blogs.oracle.com/exadata/post/database-consolidation-why-and-how
質問 # 31
Examine these commands:
1. Execute "crscti stop cluster -all" as the grid user from one database server.
2. Execute "crscti stop cluster -all" as root from one database server.
3. Power off all network switches.
4. Execute "crscti stop cluster" as root from one database server.
5. Execute "crscti stop cluster" as the grid user from one database server.
6. Power off the rack using the power switches on the PDUs.
7. Execute "shutdown -h now" on all database servers.
8. Execute "shutdown -h now" on all Exadata storage servers.
Which is the correct order or the required commands to completely power off an Exadata Database Machine in an orderly fashion?
- A. 4, 7, 8, 3, and 6
- B. 1, 8, 7, 3 and 6
- C. 2, 7, 8, and 6
- D. 5, 8, 7, and 6
- E. 2, 8, 7, 3, and 6
正解：D
解説：
Option 5 stops the clusterware on all database servers as the grid user3.
Option 8 shuts down all Exadata storage servers using their ILOM interfaces1.
Option 7 shuts down all database servers using their ILOM interfaces1.
Option 6 powers off the rack using the power switches on the PDUs2.
質問 # 32
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. Extended
- B. Normal
- C. External
- D. Sparse
- E. High
正解：E
解説：
https://www.oracle.com/technetwork/database/exadata/maa-exadata-asm-cloud-3656632.pdf According to the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book, the customer should use the High redundancy level for their ASM storage in order to ensure that their data is available on the Exadata machine during updates. The High redundancy level provides the most protection against single-node server failure, as it stores three copies of each data file on separate nodes. This is the same redundancy level used for the Oracle Database's Control Files and Redo Logs. Instructions for configuring the ASM redundancy level can be found in the book and can be referenced here: https://docs.oracle.com/cd/E80920_01/E80920/html/x9m_asm_overview.html.
質問 # 33
Which are three customer options for hosting the Platinum Services Advanced Support Gateway?
- A. Install on Exadata Engineered System.
- B. Provide individual x86 64-Bit gateway hardware.
- C. Install on Oracle Database Appliance.
- D. Install in Oracle Virtual Machine with required hardware.
- E. Purchase the recommended x86 64-Bit gateway hardware from Oracle.
正解：A、C、D
解説：
The Platinum Services Advanced Support Gateway is a component of Oracle's Platinum Services offering that enables customers to access advanced support features and tools, such as automated problem diagnosis and resolution. Customers have the option to host the Advanced Support Gateway on an Oracle Database Appliance, Oracle Virtual Machine with required hardware, or an Exadata Engineered System. These options allow customers to leverage existing infrastructure and resources to host the gateway, rather than needing to purchase and install new hardware. Providing individual x86 64-Bit gateway hardware or purchase the recommended x86 64-Bit gateway hardware from Oracle are also options but it depends on the customer's infrastructure and resources.
質問 # 34
Which three steps are required to expand an Exadata X9M-2 Database Server with the lowest memory configuration available to the highest memory configuration?
- A. Add 16x 64GB DIMMs.
- B. Remove existing memory modules.
- C. Add 24x 32GB DIMMs.
- D. Memory cannot be expanded on Exadata X9M-2 Database Servers.
- E. Shutdown the Database Server if running.
- F. Add 12x 32GB DIMMs.
- G. Add 32x 64GB DIMMs.
- H. Add 16x 32GB DIMMs.
- I. Add 12x 64GB DIMMs.
正解：A、B、H
質問 # 35
You have been asked by Oracle Support to check the firmware of the hard & flash disks in a storage server. Which cellcli command should you use to get this information?
- A. list celldisk attributes name, deviceName, diskType, physicalFirmware
- B. list cell attributes name, deviceName, diskType, physicalFirmware
- C. list physicaldisk attributes name, deviceName, diskType, physicalFirmware
- D. list devices attributes name, deviceName, diskType, physicalFirmware
正解：A
質問 # 36
You have been asked to investigate why an Exadata Database Server stopped communicating on the client network for 10 minutes over the past weekend.
Which command would help investigate this?
- A. # /opt/oracle.SupportTools/ibdiagtools/netcheck/runDiagnostics.pm -from <Fridays_Date>_17:00:00 -to <Sundays_Date>_23:59:00
- B. # /opt/oracle.SupportTools/exachk/exachk -from <Fridays_Date>_17:00:00 -to <Sundays_Date>_23:59:00
- C. # /opt/oracle.ExaWatcher/GetExaWatcherResults.sh -from <Fridays_Date>_17:00:00 -to <Sundays_Date>_23:59:00
- D. $ ${ORACLE_HOME}/suptools/tfa/release/tfa_home/bin/tfact1 -from <Fridays_Date>_17:00:00 -to <Sundays_Date>_23:59:00
正解：C
解説：
https://docs.oracle.com/en/engineered-systems/exadata-database-machine/dbmmn/maintaining-exadata-database-servers.html According to Oracle's documentation1, one of the utilities for diagnostics and repair of Oracle Exadata Storage Server is ExaWatcher, which collects operating system and network metrics on database servers and storage servers. The utility is located in the /opt/oracle.ExaWatcher directory1.
To investigate why an Exadata Database Server stopped communicating on the client network for 10 minutes over the past weekend, you can use the GetExaWatcherResults.sh script to collect and analyze ExaWatcher data for a specified time range1.
Therefore, the command that you should use to investigate this is:
/opt/oracle.ExaWatcher/GetExaWatcherResults.sh -from <Fridays_Date>_17:00:00 -to <Sundays_Date>_23:59:00
質問 # 37
What are two recommended configuration best practices for backup and recovery on Exadata?
- A. When off-site long-term backup retention is needed, use Oracle Database Backup Cloud Service as a low-cost, offsite scalable storage for a disaster recovery solution.
- B. Even if the backup was limited to writing to four tape drives, eight channels could be specified to expedite the restore process.
- C. Placing the backup network on dedicated switches installed in the top of the rack (ToR) has the benefits of isolating the backup network from other workloads and providing a greater level of control.
- D. The internal Recovery Appliance backup and restore processing is optimized when the RMAN FILESPERSET parameter is set to 1 for the level 1 incremental backup set.
正解：B、D
質問 # 38
You are adding a disk expansion kit to a running Exadata X8M Database Machine's Database Servers, and have a filesystem layout that includes:
After running the following commands, which command needs to be run to add 20G of space to the filesystem mounted on /u01?
- A. # xfs_growfs /uOl +20G
- B. # lvextend -L +20G -verbose /dev/mapper/VGExaDb-LVDbOral
- C. # lvextend -L +20G -verbose /dev/VGExaDb/LVDbOral
- D. # resize2fs +20G /dev/VGExaDb/LVDbOral
正解：B
解説：
After running the commands above, the filesystem mounted on /u01 is on the logical volume /dev/mapper/VGExaDb-LVDbOral. So, to add 20G of space to the filesystem mounted on /u01, the command that needs to be run is:
lvextend -L +20G --verbose /dev/mapper/VGExaDb-LVDbOral
This command will extend the logical volume /dev/mapper/VGExaDb-LVDbOral by 20 GB of space. It is important to note that the option --verbose is used to display the progress of the operation.
質問 # 39
......
Oracle Exadata Database Machine X8Mは、極端なパフォーマンス、拡張性、信頼性を提供する高性能なデータベースアプライアンスです。最新のハードウェアとソフトウェア技術を備え、大量のデータを迅速かつ効率的に処理することができます。Oracle 1z1-902認定試験は、この強力なデータベースマシンを構成、実装、管理する能力を候補者がテストするものです。
Oracle Exadata Database Machine X8Mは、ミッションクリティカルなデータベースの高性能、スケーラビリティ、可用性を提供するために設計された強力なデータベースアプライアンスです。このマシンはOracle Databaseテクノロジーをベースに構築され、InfiniBandネットワーク、フラッシュストレージ、高速プロセッサなどの高度なハードウェアコンポーネントが含まれています。Oracle 1z1-902試験は、Exadata Database Machine X8Mを効果的に実装および管理するために必要なすべての主要なコンセプトと技術をカバーしています。この試験に合格することで、個人のExadataデータベースマシンの実装および管理の能力が証明されます。
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