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Oracle Exadata Database Machine X8M is a state-of-the-art platform that provides high performance, scalability, and reliability for Oracle database workloads. It is designed to handle mission-critical workloads and provides a range of features such as high-speed networking, flash storage, and advanced compression techniques. 1z1-902 exam covers topics such as Exadata architecture, installation, configuration, monitoring, and maintenance.
NEW QUESTION # 18
What are two recommended configuration best practices for backup and recovery on Exadata?
- A. 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.
- B. 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.
- C. Even if the backup was limited to writing to four tape drives, eight channels could be specified to expedite the restore process.
- D. 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.
Answer: A,B
Explanation:
A recommended configuration best practice for backup and recovery on Exadata is to place the backup network on dedicated switches installed in the top of the rack (ToR). This provides a greater level of control and isolates the backup network from other workloads. Additionally, even if the backup is limited to writing to four tape drives, it is recommended to specify eight channels to expedite the restore process.
Another best practice is to set the RMAN FILESPERSET parameter to 1 for the level 1 incremental backup set. This will optimize the internal Recovery Appliance backup and restore processing. Finally, if off-site long-term backup retention is needed, Oracle Database Backup Cloud Service should be used as a low-cost, offsite scalable storage solution for a disaster recovery solution.
NEW QUESTION # 19
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. Normal
- B. External
- C. Sparse
- D. Extended
- E. High
Answer: E
Explanation:
https://www.oracle.com/technetwork/database/exadata/maa-exadata-asm-cloud-3656632.pdf
NEW QUESTION # 20
Which two of the following network connection types can be deployed on the client network ports of an Exadata X9M-2 Database Server?
- A. 2x 10Gb ports on eth1 and eth2 using FU45 cat6 cable for client network, and 2x 25Gb ports on eth11 and eth12 using SFP28 transceivers and OM4 fiber cable for backup network
- B. 2x 25Gb ports on eth1 and eth2 using SFP28 transceivers and OM4 fiber cable for backup network, and 2x 10Gb ports on eth3 and eth4 using RJ45 cat6 cable for client network
- C. 2x 25Gb ports on eth1 and eth2 using SFP28 transceivers and OM4 fibre cable for client network, and 2x 10Gb ports on eth9 and eth10 using RJ45 cat6 cable for backup network
- D. 2x 25Gb ports on eth1 and eth2 using SFP28 transceivers and OM4 fiber cable for backup network, and 2x 25Gb ports on eth5 and eth6 using SFP28 transceivers and OM4 fiber cable for client network
Answer: B,C
Explanation:
Statement D is true as the Exadata X9M-2 Database Server has two 25Gb ports on eth1 and eth2 using SFP28 transceivers and OM4 fiber cable for backup network, and two 10Gb ports on eth3 and eth4 using RJ45 cat6 cable for client network, as stated in the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book (page 24).
Statement B is also true as the Exadata X9M-2 Database Server has two 25Gb ports on eth1 and eth2 using SFP28 transceivers and OM4 fibre cable for client network [1][2], and two 10Gb ports on eth9 and eth10 using RJ45 cat6 cable for backup network, as stated in the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book (page 24).
NEW QUESTION # 21
Which two sections of the AWR report shows statistics for X9M Persistent Memory Cache?
- A. PMEM Pool Misses in the Exadata Outlier Summary
- B. PMEM Pool cache Read Hits in the Cache Sizes portion of the Report Summary
- C. PMEM Cache section within Exadata Smart Statistics
- D. cell PMEM cache Read Hits in the Database IOs portion of the Performance Summary
- E. PMEM Cache section within Memory Statistics
Answer: E
NEW QUESTION # 22
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. # resize2fs +20G /dev/VGExaDb/LVDbOral
- B. # lvextend -L +20G -verbose /dev/mapper/VGExaDb-LVDbOral
- C. # xfs_growfs /uOl +20G
- D. # lvextend -L +20G -verbose /dev/VGExaDb/LVDbOral
Answer: B
Explanation:
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.
NEW QUESTION # 23
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. Exadata storage realms using ASM-scoped security mode
- B. File permissions on the griddisks in each storage server
- C. File permissions on the griddisks in each database server
- D. Using EXADCLI instead of CELLCLI to create the griddisks
- E. Exadata storage realms using database-scoped security mode
Answer: B,D
NEW QUESTION # 24
Which two statements are true in regards to starting the Exadata Virtual Machine?
- A. Use vm_maker -start-domain to start a virtual machine manually.
- B. Use vm_maker boot-from-iso command to boot a virtual machine.
- C. To streamline the diagnosis of virtual machines, one ISO file is used for multiple Oracle Exadata System Software releases.
- D. To see Oracle Linux boot messages during guest startup, use -console option with the vm_maker -start-domain command.
- E. Use vm_maker -auto-start command to configure a virtual machine to start automatically when the KVM host is started.
Answer: B,E
NEW QUESTION # 25
Which dbmcli command is NOT valid on Exadata X9M?
- A. dbmcli -e "LIST METRICHISTORY WHERE name LIKE 'DS_.*'"
- B. dbmcli -e "LIST IBPORT DETAIL"
- C. dbmcli -e "LIST ALERTHISTORY WHERE agelnMinutes < 15"
- D. dbmcli -e "LIST METRICCURRENT WHERE name = 'DS_TEMP' "
Answer: C
Explanation:
1. dbmcli -e "LIST METRICHISTORY WHERE name LIKE 'DS_.*'" is valid command and it is used to list the historical values for metrics where the name starts with "DS_."
2. dbmcli -e "LIST METRICCURRENT WHERE name = 'DS_TEMP' " is valid command and it is used to list the current value of the metric named "DS_TEMP"
3. dbmcli -e "LIST IBPORT DETAIL" is valid command and it is used to list the InfiniBand ports and details of the Exadata X9M.
"dbmcli" is a command-line tool that is used to manage and monitor the Exadata Database Machine. It allows you to perform various tasks such as managing the database, storage, and network components, and monitoring the performance and health of the machine. The command "dbmcli -e "LIST ALERTHISTORY WHERE agelnMinutes < 15" is not a valid command, it is not supported on Exadata X9M.
NEW QUESTION # 26
For which four component failures on an X9M Database Machine does Auto Service Request (ASR) raise service requests?
- A. RoCE network interface cards in the database servers
- B. power supplies in the database servers
- C. Cisco RDMA over Converged Ethernet (RoCE) switches
- D. power distribution units
- E. Cisco management switch
- F. fans in the storage servers
- G. RoCE network interface cards in the storage servers
Answer: B,C,E,G
NEW QUESTION # 27
Which are two correct statements for managing virtual deployment using Oracle Exadata Deployment Assistant (OEDA)?
- A. OEDA allows customers to have both bare metal (BM) and virtual machine (VM) in an Exadata X9M Quarter Rack.
- B. OEDA sets up key-based authentication for the root user by using the setuprootssh.sh utility included with OEDA.
- C. There is no limit on the number of VMs in an Exadata rack as long as the Exadata rack has adequate resources.
- D. OEDA deployment steps include calibrate cells, create cell disks, and resecure machine.
Answer: A,B
Explanation:
Oracle Exadata Deployment Assistant (OEDA) enables customers to deploy Oracle Exadata Database Machine in virtualized environments and it support both bare metal and virtual machine deployment in an Exadata X9M Quarter Rack.
OEDA allows customers to have both bare metal (BM) and virtual machine (VM) in an Exadata X9M Quarter Rack, and it sets up key-based authentication for the root user by using the setuprootssh.sh utility included with OEDA. According to the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book [1][2], OEDA deployment steps include setup, configure, deploy, and manage. The number of VMs in an Exadata rack is limited by the available resources in the rack, such as CPU, Memory, and Storage.
NEW QUESTION # 28
You are concerned about the operating temperature of the database servers in your Exadata Full Rack and want to be alerted if the server exceeds 30C.
What command should use use to generate alerts for such an event?
- A. dbmcli -e "alert metriccurrent ds_temp where metricValue > 30" on each database server
- B. dbmcli -e "create threshold ds_temp comparison='>', critical=30" on each database server
- C. dbmcli -e "set alert ds_temp> 30" on each database server
- D. dbmcli -e "set threshold ds_temp comparison=' >', critical=30" on each database server
Answer: B
Explanation:
According to Oracle's documentation1, to set a threshold for a metric on a database server, you need to use the create threshold command with the appropriate parameters. The set threshold command is used to modify an existing threshold2.
Therefore, the command that you should use to generate alerts for such an event is:
dbmcli -e "create threshold ds_temp comparison='>', critical=30" on each database server1
NEW QUESTION # 29
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. Wait for the email of the failure that Exadata or Enterprise Manager will send.
E Download and run the latest exadiag tool. - B. Call Oracle Support and make an appointment so that the drive can be replaced.
- C. Ask the system administrator to replace the broken disk with a spare.
- D. Check the database to see if any rebalance operations are active.
- E. Wait for a blue light to appear on the disk if the rebalance operation is running.
Answer: C
NEW QUESTION # 30
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. Normal
- B. External
- C. Sparse
- D. Extended
- E. High
Answer: E
Explanation:
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.
NEW QUESTION # 31
Which three statements are true about the CELLCLI command?
- A. It requires root privileges to create CELLDISKS and GRIDDISKS.
- B. It can be executed using the DCLI utility.
- C. It has command-line history.
- D. It can be executed on storage servers.
- E. It can execute commands on multiple storage servers in parallel.
Answer: B,C,D
Explanation:
The statements that are true about the CellCLI command are:
It has command-line history . According to 1, you can use the up and down arrow keys to scroll through previous commands that you entered in CellCLI . You can also use Ctrl+R to search for a previous command by entering part of it .
It can be executed on storage servers . According to 1, you can invoke CellCLI by logging in to the Exadata cell as cellmonitor , celladmin , or root user and typing "cellcli" . Within CellCLI , you can perform various management and monitoring tasks for the cell134.
It can be executed using the DCLI utility . According to 5, DCLI (distributed CLI) is another utility that can be used to execute scripts and commands across multiple storage cells from a single interface. You can use DCLI to run CellCLI commands on multiple cells at once54.
NEW QUESTION # 32
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 storage server
- B. Exadata storage realms using ASM-scoped security mode
- C. Using EXADCLI instead of CELLCLI to create the griddisks
- D. File permissions on the griddisks in each database server
- E. Exadata storage realms using database-scoped security mode
Answer: A,B
Explanation:
When multiple databases share space on the storage servers in an unpartitioned storage grid, two Exadata security features can be configured to control which databases can access which griddisks.
Exadata storage realms using ASM-scoped security mode: This feature allows you to create storage realms and assign them to specific databases. This allows you to control which databases have access to which griddisks. The ASM-scoped security mode applies to all griddisks within an ASM disk group, which means that all griddisks in a disk group will be accessible only to the databases that belong to the assigned storage realm.
File permissions on the griddisks in each storage server: This feature allows you to configure file permissions on the griddisks at the storage server level. You can assign specific permissions to specific users or groups, allowing you to control which databases can access which griddisks.
NEW QUESTION # 33
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