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Oracle 1z1-902試験は、Oracle Databaseでの作業経験があり、Oracle Exadata Database Machine X8Mアーキテクチャ、機能、および機能に精通している専門家を対象としています。試験に合格した候補者は、ハードウェア、ソフトウェア、およびストレージコンポーネントを含むOracle Exadata Database Machine X8Mシステムをインストール、構成、および管理する能力を証明します。また、Oracle Exadata Database Machine X8MのベストプラクティスやOracle Database In-Memory、Oracle Automatic Storage Management（ASM）などの高度な機能について深い理解が求められます。

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Oracle Exadata Database Machine X8M Implementation Essentials 認定 1z1-902 試験問題 (Q41-Q46):

質問 # 41
You are going to create an ACFS Filesystem for use as a staging area for data loads. Examine the following commands:

What steps and in which order should they be executed?

A. 6, 3, 1, 9, 7, 8
B. 6, 2, 1, 8, 4, 5
C. 6, 1, 2, 7, 5, 8
D. 6, 8, 3, 4, 2, 1

正解：B

解説：
The steps and the order in which they should be executed to create an ACFS Filesystem for use as a staging area for data loads are:
asmcrad volcreate -G data -s 1024G acfs_dataload_vol : This command creates a new volume in the data diskgroup, with a size of 1024 GB, and named acfs_dataload_vol.
asmcmd vol info -G data acfs_dataload_vol | grep Device: This command will show the device name of the newly created volume
/usr/sbin/mkfs -t acfs /dev/asm/ac:fs_dataload_vol-123: This command creates a new ACFS filesystem on the volume created in step 1 sudo /u01/app/19.0.0.0/grid/bin/srvctl start filesystem -device /dev/asn/acfs_dataload_vol-123: This command starts the filesystem created in step 3 sudo chovn -R oracle:dba /mnt/acfs_dataload_vol: This command changes the ownership of the /mnt/acfs_dataload_vol to the oracle:dba user.
/sbin/acfsutil snap create -v data_load /mnt/acfs_dataload_vol: This command creates a snapshot of the filesystem to be used as a staging area.
acfsutil size +2S0G -d /dev/asm/acfs_dataload_vol-123 /mnt/acfs_dataload_vol/ : This command increases the size of the filesystem by 2GB
/u01/app/19-G.O-Q7grid/bin/srvctl add filesystem -device /dev/asm/acfs_dataload_vol-

質問 # 42
How do ASM failure groups provide redundancy?

A. 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.
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 contain all ASM disks in a single storage server preventing mirror copies being written to the same storage server.

正解：D

解説：
In an Automatic Storage Management (ASM) environment, failure groups are used to provide redundancy for the storage disks. Failure groups are used to group together a set of disks and ensure that no two copies of the same data are stored on the same physical disk or storage server. This way, if a disk or storage server fails, the data can still be accessed from the other copy.
For example, if the disks in a failure group are mirrored, one copy of the data is stored on one set of disks, and the other copy is stored on another set of disks. This way, if a disk or storage server fails, the data can still be accessed from the other copy.
ASM failure groups also provide the option to spread the data across different storage servers, this way, even if a storage server fails, data can still be accessed from the other storage servers in the group. This will improve the availability of the data.

質問 # 43
Which two statements are true about the initial storage configuration after the standard (non-virtualized) deployment of a new Exadata Database Machine with High Capacity storage servers?

A. The DATA_<DBM_Name> and RECO_<DBM_NAME> ASM diskgroups are built on with DATA on the outer-most tracks and RECO on the inner-most tracks of the physical disk.
B. The sparse_<DBM_NAME> diskgroup is created automatically.
C. There is free space available on flashdisks inside the Exadata storage servers for possible use for storage indexes.
D. There is free space available on flashdisks inside the Exadata storage servers to configure Exadata Smart Flash Logs.
E. There is free space available on the hard disks inside the database servers for possible extension of the /uoi file system.

正解：C、D

解説：
According to the Oracle Exadata Database Machine Technical Architecture1, the initial storage configuration after the standard (non-virtualized) deployment of a new Exadata Database Machine with High Capacity storage servers includes two ASM disk groups: DATA_<DBM_Name> and RECO_<DBM_NAME>. These disk groups are built on hard disks and flash disks inside the Exadata Storage Servers1.
The correct statements about this configuration are:
Option D: There is free space available on flashdisks inside the Exadata storage servers for possible use for storage indexes. Storage indexes are a feature of Exadata Storage Software that can improve query performance by avoiding unnecessary I/O operations. Storage indexes use a small amount of flash memory to store metadata about data blocks stored on disk1.
Option E: There is free space available on flashdisks inside the Exadata storage servers to configure Exadata Smart Flash Logs. Exadata Smart Flash Logs are another feature of Exadata Storage Software that can improve database performance by using flash memory as an extension of the database redo log buffer. This can reduce latency and increase throughput for redo log writes1.

質問 # 44
What is the minimum Oracle Linux version required to support RoCE and Persistent Memory?

A. Oracle Linux 7.7
B. Oracle Linux 8.0
C. Oracle Linux 6.9
D. Oracle Linux 7.5

正解：D

質問 # 45
Which are two correct statements about backing up Exadata Database Machine?

A. For high availability, system area can be on the first two disks and M.2 devices.
B. Backing up Exadata Storage Server Software is critical for restoration.
C. 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.
D. Backup of the Oracle Cluster Registry, which also contains Voting Disk information, is automatically maintained on the file system of the first database server.
E. Use a snapshot-based backup of an Oracle Exadata Database Machine database server software.

正解：C、D

質問 # 46
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