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Oracle 1z1-902：Oracle Exadata Database Machine X8M Implementation Essentialsは、ITプロフェッショナルの知識とスキルをテストする試験で、Oracle Exadata Database Machine X8Mの実装および管理を行います。試験は、Exadata Database Machineのインストール、設定、最適化能力を検証するように設計されています。Exadata Database Machineは、ハードウェアとソフトウェアを組み合わせて、ミッションクリティカルなデータベースのパフォーマンス、可用性、および拡張性を提供する高性能データベースマシンです。

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Oracle 1Z0-902：Oracle Exadata Database Machine X8M Implementation Essentials試験は、Exadata Database Machine X8Mを実装することを目指すプロフェッショナルのスキルと知識を検証することを意図した広く認知された認定試験です。認定試験は、候補者がExadata Database Machine X8Mを実装するために必要なスキルと知識を持っていることを証明するために設計されています。この認定はIT業界で高く評価され、プロフェッショナルがキャリアを進めるのに役立ちます。

Oracle Exadata Database Machine X8M Implementation Essentials 認定 1z1-902 試験問題 (Q76-Q81):

質問 # 76
Which two statements are false about backup to ZFS Storage Appliance (ZFSSA)?

A. Top of Rack (ToR) switches are managed as part of the hardware stack and software levels are upgraded during the patching process.
B. ZFS Snapshots can provide rapid cloning of development and test environment.
C. ZFSSA may connect directly to the Exadata 100Gb RoCE network switches.
D. When backing up multi-rack systems, sharing Exadata X9M switches is recommended.

正解：C、D

解説：
1. ZFS Storage Appliance (ZFSSA) can't connect directly to the Exadata 100Gb RoCE network switches. ZFSSA uses Fibre Channel protocol to connect to the Exadata storage cells. C. When backing up multi-rack systems, sharing Exadata X9M switches is not recommended. Each rack should have its own switches to minimize the risk of data loss due to switch failure.
Review the safety guidelines.
Unpack Oracle Exadata Rack.
Let the Exadata acclimatize for 24 hours.
Place Exadata in its allocated space.
Stabilize the Exadata Rack.
Power on Exadata PDU A.
Power on Exadata PDU B.
This order ensures that the necessary safety precautions are taken before installing the Exadata Database Machine, and that the machine is allowed to acclimate to its new environment before being powered on.

質問 # 77
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.ExaWatcher/GetExaWatcherResults.sh -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.SupportTools/ibdiagtools/netcheck/runDiagnostics.pm -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：B

解説：
Exachk is an Oracle-provided diagnostic tool that allows you to check various components of an Exadata Database Server, including the client network. The tool is located in the /opt/oracle.SupportTools/exachk/ directory and can be run with the command: exachk. This command can be run with the option -from <Fridays_Date>_17:00:00 and -to <Sundays_Date>_23:59:00 to specify a time range of interest, this way you can check the client network status between the specified time range. The tool checks the status of various components such as network interfaces, InfiniBand fabric, and storage servers. It also analyzes log files, configuration files, and system settings to detect any issues. The tool generates a report, which can be used to identify the root cause of the issue and provide recommendations for resolution.
Tfact1 is a tool to collect diagnostic information from Exadata and non-Exadata systems and it is not related to client network status.
Netcheck and GetExaWatcherResults.sh are not tools provided with the Exadata Database Server and they are not related to client network status.

質問 # 78
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. cellcli (or exacli/exadcli) to examine storage server metrics such as database, category, ceiidisk, and griddisk
D. OS I/O metrics using OS tools such as iostat on the storage servers
E. OS I/O metrics using OS tools such as iostat on the database servers

正解：C、E

質問 # 79
Which two statements are true in regards to starting the Exadata Virtual Machine?

A. Use vm_maker boot-from-iso command to boot a virtual machine.
B. To streamline the diagnosis of virtual machines, one ISO file is used for multiple Oracle Exadata System Software releases.
C. To see Oracle Linux boot messages during guest startup, use -console option with the vm_maker -start-domain command.
D. Use vm_maker -start-domain to start a virtual machine manually.
E. Use vm_maker -auto-start command to configure a virtual machine to start automatically when the KVM host is started.

正解：D、E

質問 # 80
Which two Exadata security features would you configure to control which databases can access which griddisks, when multiple databases share space on your storage servers in an unpartitioned storage grid?

A. File permissions on the griddisks in each database server
B. Using EXADCLI instead of CELLCLI to create the griddisks
C. Exadata storage realms using ASM-scoped security mode
D. Exadata storage realms using database-scoped security mode
E. File permissions on the griddisks in each storage server

正解：B、E

質問 # 81
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