Prepare 1z1-902 Exam Questions [2023] Recently Updated Questions [Q18-Q41]

Prepare 1z1-902 Exam Questions [2023] Recently Updated Questions

Give push to your success with 1z1-902 exam questions

To prepare for the Oracle 1z1-902 certification exam, candidates can take advantage of various training resources provided by Oracle, including instructor-led courses, online training, and self-study materials. Candidates can also gain practical experience by working with Oracle Exadata Database Machine X8M in a real-world environment.

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NEW QUESTION # 18
You are updating your Exadata X9M-2 Elastic Database Machine with 6 database servers and 12 High Capacity Storage Servers. You will be using patchmgr to apply updates across the entire machine while still maintaining database availability.
Assuming you are driving patchmgr from an external server, which statement is true about the execution phase?

• A. patchmgr must be invoked with the -rolling argument. Each component type must be upgraded independently of the other.
• B. patchmgr must be invoked with the -rolling argument with all database and storage servers listed in a single input file.
• C. patchmgr cannot apply updates in a rolling manner, you must manually apply patches with the dbnodeudpate and cellupdate tools if high availability is required.
• D. patchmgr will apply patches in component groups consisting of 1 database server and 2 storage servers to minimize disruption.

Answer: D

Explanation:
According to the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book [1], patchmgr can be used to apply updates in a rolling manner while still maintaining database availability. It will apply patches in component groups consisting of 1 database server and 2 storage servers to minimize disruption. This is done by invoking patchmgr with the -rolling argument and specifying the component groups in the input file.

NEW QUESTION # 19
Which statement is true about the patching features provided in Platinum Services?

• A. Oracle Platinum Service covers Exadata storage software and firmware patching, but customers must perform the database patching.
• B. Patching services are available for the full software stack up to twice per year.
• C. Patching is done automatically during business hours.
• D. The rolling and complete down time approaches are two options to patching.

Answer: A

NEW QUESTION # 20
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 # 21
Which four actions should you take before proceeding with applying updates to your Exadata Database Machine?

• A. Consult My Oracle Support note 888828.1 to determine the current recommended Exadata software release.
• B. For database servers, perform a server backup using patchmgr -dbnodes db_list_file -backup -rolling.
• C. Check the Exadata Critical Issues My Oracle Support note 1270094.1 for any issues not added to the latest version of exachk.
• D. Run the appropriate patchmgr preqequisite check step for each component being updated.
• E. Run patchmgr --all_comp -autofix -autobackup -upgrade -rolling.
• F. Run exachk and resolve only WARNINGS that you have not seen before.

Answer: A,B,D,E

NEW QUESTION # 22
A new Exadata Quarter Rack with 2 Database Servers and 3 HC Storage Servers and 3-phase 15kVA PDUs is being installed in a Data Center. However, the Data Center is only providing enough power for a single cable from each PDU.
Which statement is correct?

• A. The installation can go ahead, no change is required.
• B. A splitter cable can be used to provide power to all PDU cables.
• C. The power cables from the servers to the PDUs can be rearranged inside the rack following OECA guidance to utilize a single PDU power cable.
• D. The installation cannot proceed until two power feeds are available per PDU.

Answer: D

Explanation:
An Exadata Quarter Rack with 2 Database Servers and 3 HC Storage Servers and 3-phase 15kVA PDUs would typically require two power feeds per PDU, one for each of the two power distribution units (PDUs) in the rack. A single power feed per PDU is not sufficient to provide the necessary power to the servers and storage in the rack.

NEW QUESTION # 23
Which statement is true about the Persistent Memory Commit Accelerator?

• A. Persistent Memory Commit Accelerator reduces redo log write latency by using Persistent Memory and RDMA before flushing to Flash then disk.
• B. Persistent Memory Commit Accelerator tracks changes to Persistent Memory Data Accelerator to ensure duplicate blocks are not written to Flash.
• C. Persistent Memory Commit Accelerator contains logging information from all tiers of the software stack for rapid triage and diagnostics.
• D. Persistent Memory Commit Accelerator copies redo log data from disk for faster redo apply on Data Guard Standby Databases.
• E. Persistent Memory Commit Accelerator helps to further reduce redo log write latency by using Persistent Memory and Remote Direct Memory Access (RDMA).

Answer: A

Explanation:
Persistent Memory Commit Accelerator reduces redo log write latency by using Persistent Memory and RDMA before flushing to Flash then disk. This helps to further reduce redo log write latency by utilizing the speed and low latency of Persistent Memory, along with the Remote Direct Memory Access (RDMA) protocol, to commit changes to disk faster. This allows the system to quickly commit changes to disk, resulting in improved performance and reduced latency.
This is according to the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book and Resources [1][2]. The Persistent Memory Commit Accelerator uses Persistent Memory and Remote Direct Memory Access (RDMA) technology to write redo log data to Flash and disk, resulting in improved latency and higher throughput. Additionally, the Accelerator tracks changes to Persistent Memory Data Accelerator to ensure duplicate blocks are not written to Flash [1], further reducing latency.

NEW QUESTION # 24
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, but are not enabled by default.
• B. Install Oracle Rest Data Services on each Storage server and install the MS APEX application.
• C. 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.
• D. Install Oracle Rest Data Services on each Database server and install the MS APEX application.

Answer: A

Explanation:
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).

NEW QUESTION # 25
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.
• B. Download and run the latest exadiag tool.
• C. Call Oracle Support and make an appointment so that the drive can be replaced.
• D. Ask the system administrator to replace the broken disk with a spare.
• E. Check the database to see if any rebalance operations are active.
• F. Wait for a blue light to appear on the disk if the rebalance operation is running.

Answer: D

NEW QUESTION # 26
You have been tasked with replacing a memory module of an Exadata Storage Server and need to power off the affected storage server. Which two commands must you execute to safely power off the storage server in an Exadata X9M Database Machine?

• A. CeLLCLI> list GRIDDISK where status != 'inactive' on the affected storage server
• B. CellCLI alter GRIDDISK all inactive on the affected storage server
• C. 'crsct1 stop cluster -all' on one of the database servers
• D. CellCLI LIST GRIDDISK ATTRIBUTES name WHERE asmdeactivationoutcome != 'Yes' on the affected Storage server
• E. shutdown -h now' on the affected storage server
• F. CeLLCLI> alter cell shutdown SERVICES all on the affected storage server

Answer: B,E

Explanation:
https://docs.oracle.com/en/engineered-systems/exadata-database-machine/dbmmn/maintaining-exadata-storage-servers.html#GUID-AE16A1DA-53C6-4E80-94E5-963AA65373AB The two commands that must be executed to safely power off the storage server in an Exadata X9M Database Machine are E and F.
Command E, CellCLI alter GRIDDISK all inactive, will deactivate all of the GRIDDISKS on the affected storage server. This will ensure that no data is lost during the power-off process.
Command F, shutdown -h now, will shut down the storage server. This will ensure that the storage server is completely powered off and no data is lost.
For more information on how to properly power off an Exadata Storage Server, refer to the Oracle Exadata Database Machine X9M Implementation Essentials official text book and resources [1][2].
https://support.oracle.com/knowledge/Oracle%20Database%20Products/1188080_1.html

NEW QUESTION # 27
Which are three customer options for hosting the Platinum Services Advanced Support Gateway?

• A. Install on Oracle Database Appliance.
• B. Install on Exadata Engineered System.
• C. Purchase the recommended x86 64-Bit gateway hardware from Oracle.
• D. Install in Oracle Virtual Machine with required hardware.
• E. Provide individual x86 64-Bit gateway hardware.

Answer: B,C,E

Explanation:
These options are outlined in the Oracle Exadata Database Machine X9M Implementation Essentials official text book and resources. The customer can choose to either provide their own x86 64-Bit gateway hardware or purchase the recommended hardware from Oracle, or they can install the gateway on an Exadata Engineered System.

NEW QUESTION # 28
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 Virtual Machine clusters supporting a single database for greatest resource isolation
• C. Multiple pluggable databases in one or more container databases on a Virtual Machine or Bare Metal cluster
• D. Multiple Databases on a cluster
• E. Multiple databases spanning a Bare Metal and Virtual Machine cluster to provide resource isolation and consolidation concurrently
• F. A single database with one or more schema per application

Answer: C,D,E

Explanation:
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.

NEW QUESTION # 29
You have configured a multirack Database Machine with two X9M-8 full racks all in a single cluster and storage grid comprising a total of 4 X9M-8 Database servers and 28 X9M-8 Storage servers.
Which two options are true regarding the servers on which Enterprise Manager agents must be deployed in order to monitor all components of this multirack configuration?

• A. on all database servers in the second rack
• B. on all database servers in both racks and one storage server in each rack
• C. on all storage servers in both racks
• D. on only one database server in both racks
• E. on all database servers in the first rack
• F. on all database servers and at least two storage servers in both racks
• G. on at least two storage servers in both racks

Answer: C,E

NEW QUESTION # 30
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 32x 64GB DIMMs.
• B. Shutdown the Database Server if running.
• C. Remove existing memory modules.
• D. Memory cannot be expanded on Exadata X9M-2 Database Servers.
• E. Add 16x 64GB DIMMs.
• F. Add 12x 32GB DIMMs.
• G. Add 12x 64GB DIMMs.
• H. Add 24x 32GB DIMMs.
• I. Add 16x 32GB DIMMs.

Answer: B,C,E

Explanation:
1. Remove existing memory modules: Before adding new memory modules, the existing memory modules should be removed.
2. Add 16x 64GB DIMMs: The new DIMMs should be added, in this case is 16 DIMMs of 64GB each, which will expand the memory to the highest configuration available.
3. Shutdown the Database Server if running: The Database Server should be shutdown before adding new memory modules in order to prevent any possible data loss or corruption.
The steps required to expand an Exadata X9M-2 Database Server with the lowest memory configuration available to the highest memory configuration are as follows:
Shutdown the Database Server if running.
Remove existing memory modules.
Add 16x 64GB DIMMs.
For reference, the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book states that "the lowest memory configuration for the Exadata X9M-2 Database Servers is 384GB and the highest is 768GB [1]. The memory upgrade is done in increments of 64GB using 16x 64GB DIMMs".

NEW QUESTION # 31
Which two statements are false about backup to ZFS Storage Appliance (ZFSSA)?

• A. ZFS Snapshots can provide rapid cloning of development and test environment.
• B. Top of Rack (ToR) switches are managed as part of the hardware stack and software levels are upgraded during the patching process.
• 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.

Answer: C,D

Explanation:
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.

NEW QUESTION # 32
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 devices attributes name, deviceName, diskType, physicalFirmware
• B. list celldisk attributes name, deviceName, diskType, physicalFirmware
• C. list physicaldisk attributes name, deviceName, diskType, physicalFirmware
• D. list cell attributes name, deviceName, diskType, physicalFirmware

Answer: C

Explanation:
This command will display the name, deviceName, diskType and physicalFirmware attributes of the physicaldisks in a storage server, as explained in the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book (page 85).
https://docs.oracle.com/en/engineered-systems/exadata-database-machine/sagug/exadata-storage-server-cellcli.html

NEW QUESTION # 33
Which two statements are true about Auto Service Request (ASR) with an Exadata Database Machine?

• A. ASR can upload configuration metadata to support problem resolution.
• B. ASR communicates with Oracle support services using HTTPS.
• C. ASR Manager must be installed and configured on one of the database servers.
• D. ASR Manager opens a service request (SR) automatically after sensors detect hardware faults.
• E. ASR Manager must be installed and configured on a dedicated server external to the Database Machine.
• F. Configuring ASR is mandatory for all Database Machine assets.

Answer: B,E

Explanation:
A and F are true statements about Auto Service Request (ASR) with an Exadata Database Machine [1][2]. In order to use the ASR feature, ASR Manager must be installed and configured on a dedicated server which is external to the Database Machine, and it communicates with Oracle support services using HTTPS. Additionally, ASR can upload configuration metadata to support problem resolution, and it can open a service request (SR) automatically after sensors detect hardware faults.
Reference for this information can be found in the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book and Resources [1][2].

NEW QUESTION # 34
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 # 35
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 OS tools such as iostat on the storage servers
• B. OS I/O metrics using Enterprise Manager host pages for the storage servers
• C. 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
• 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 database servers

Answer: D,E

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 # 36
You are updating your Exadata X9M-2 Elastic Database Machine with 6 database servers and 12 High Capacity Storage Servers. You will be using patchmgr to apply updates across the entire machine while still maintaining database availability.
Assuming you are driving patchmgr from an external server, which statement is true about the execution phase?

• A. patchmgr will apply patches in component groups consisting of 1 database server and 2 storage servers to minimize disruption.
• B. patchmgr must be invoked with the -rolling argument. Each component type must be upgraded independently of the other.
• C. patchmgr must be invoked with the -rolling argument with all database and storage servers listed in a single input file.
• D. patchmgr cannot apply updates in a rolling manner, you must manually apply patches with the dbnodeudpate and cellupdate tools if high availability is required.

Answer: C

Explanation:
According to Oracle documentation12, patchmgr is the utility used to update software for Exadata infrastructure components. It can apply patches in a rolling or non-rolling manner depending on the argument and input file provided.

NEW QUESTION # 37
Which two statements are true in regards to starting the Exadata Virtual Machine?

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

Answer: C,D

NEW QUESTION # 38
Examine this list of software components:
1. Oracle KVM Guest
2. Oracle Enterprise Manager Agent (OMA)
3. ASM instance
4. RDBMS instance
5. Automatic Diagnostic Repository Command Interpreter (ADRCI)
6. CELLCLI
7. Cell Server(CELLSRV)
8. diskmon
9. Restart Server (RS)
10. Management Server (MS)
What is the correct location where these software components can run in the standard Exadata Database Machine deployment?

• A. 3, 4, 8, and 10 run on the database servers; 1, 2, 5, 6, 7 and 9 run on the Exadata storage servers.
• B. 1, 2, 3, 4, 9 and 10 run on the database servers; 5, 6, 7, 8, 9, and 10 run on the Exadata storage servers.
• C. 2, 3, 4, 8, and 10 run on the database servers; 1, 5, 6, 7and 9 run on the Exadata storage servers.
• D. 1, 2, 3, 4, 5, 8, 9 and 10 run on the database servers; 5, 6,7, 9 and 10 run on the Exadata storage servers.
• E. 1, 2, 3, 4, 8 and 9 run on the database servers; 5, 6, 7, 9 and 10 run on the Exadata storage servers.

Answer: D

Explanation:
Oracle KVM Guest: This is a virtual machine that runs on top of Oracle Linux KVM hypervisor. It can be used to run Oracle Database or other applications on Exadata Database Machine2. Therefore, it runs on the Database Servers.
Oracle Enterprise Manager Agent (OMA): This is a software agent that communicates with Oracle Enterprise Manager Cloud Control and provides monitoring and management capabilities for Exadata Database Machine2. Therefore, it runs on both Database Servers and Storage Servers.
ASM instance: This is an instance of Oracle Automatic Storage Management (ASM), which is a volume manager and a file system for Oracle Database files. It manages disk groups that span across multiple Storage Servers2. Therefore, it runs on the Database Servers.
RDBMS instance: This is an instance of Oracle Database that processes SQL statements and executes transactions. It uses ASM disk groups to store data files, control files, redo log files, etc2. Therefore, it runs on the Database Servers.
Automatic Diagnostic Repository Command Interpreter (ADRCI): This is a command-line tool that enables you to view diagnostic data stored in the Automatic Diagnostic Repository (ADR). ADR is a file-based repository for database diagnostic data such as trace files, alert logs, etc2. Therefore, ADRCI runs on both Database Servers and Storage Servers, depending on where the ADR is located.
CELLCLI: This is a command-line interface that enables you to configure and manage Exadata Storage Server Software. It allows you to perform tasks such as creating disk groups, monitoring cell health, applying patches, etc2. Therefore, it runs on the Storage Servers.
Cell Server(CELLSRV): This is a process that runs on each Storage Server and handles I/O requests from the Database Servers. It implements Exadata Smart Scan , which offloads data-intensive SQL operations from the Database Servers to the Storage Servers2. Therefore, it runs on the Storage Servers.
diskmon: This is a process that monitors the status of disks and flash devices on each Storage Server. It reports disk failures and performs automatic disk reclamation2. Therefore, it runs on the Storage Servers.
Restart Server (RS): This is a process that manages automatic restarts of critical processes such as CELLSRV , MS , or OMA in case of failures. It also handles graceful shutdowns and startups of all processes on each server2. Therefore, it runs on both Database Servers and Storage Servers.
Management Server (MS): This is a process that provides management services for each server such as collecting metrics , logging events , executing commands from CELLCLI , etc2. Therefore, it runs on both Database Servers and Storage Servers

NEW QUESTION # 39
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, 8, 3, 4, 2, 1
• B. 6, 2, 1, 8, 4, 5
• C. 6, 3, 1, 9, 7, 8
• D. 6, 1, 2, 7, 5, 8

Answer: C

NEW QUESTION # 40
Which of the following is NOT a requirement when validating, receiving, unpacking, and planning access route and space requirements for Exadata Database Machine?

• A. Oracle Exadata Rack may only be installed on raised floor environments.
• B. 914mm of space required above the rack height is required for maintenance access.
• C. All four leveling and stabilizing feet should be raised and out of the way prior to moving the rack.
• D. The entire access route to the installation site should be free of raised-pattern flooring that can cause vibration.
• E. The incline of any access route ramp must be less than or equal to 6 degrees.
• F. A conditioned space is required to remove the packaging material to reduce particles before entering the data center.

Answer: F

NEW QUESTION # 41
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