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Oracle 1z1-902 exam is an essential certification for IT professionals who are responsible for implementing and managing the Oracle Exadata Database Machine X8M. 1z1-902 exam tests candidates' knowledge and skills in various areas, including architecture, hardware components, software components, configuration, performance tuning, and troubleshooting. Passing the exam validates the candidate's ability to install, configure, and optimize the Exadata Database Machine, which is a critical tool for organizations that require high-performance databases.
Oracle Exadata Database Machine X8M is a high-performance database system that is designed to provide faster data processing and storage capabilities. The system is built with advanced hardware and software components that work together to deliver unmatched performance and scalability. The Oracle 1z1-902 certification exam is an industry-recognized credential that verifies an individual's skill and knowledge in implementing and managing the Exadata database machine X8M.
NEW QUESTION # 30
What is the minimum Oracle Linux version required to support RoCE and Persistent Memory?
- A. Oracle Linux 7.5
- B. Oracle Linux 7.9
- C. Oracle Linux 8.0
- D. Oracle Linux 7.7
Answer: B
Explanation:
Oracle Linux 7.9 is the minimum version required to support RoCE and Persistent Memory. This is because Oracle Linux 7.9 includes kernel enhancements that enable RDMA over Converged Ethernet (RoCE) networking and Intel Optane DC Persistent Memory Modules (DCPMM) for Exadata X8M systems3. These features allow faster access latency and higher throughput for database workloads2.
NEW QUESTION # 31
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. Download and run the latest exadiag tool.
- B. Wait for a blue light to appear on the disk if the rebalance operation is running.
- C. Ask the system administrator to replace the broken disk with a spare.
- D. Wait for the email of the failure that Exadata or Enterprise Manager will send.
- E. Call Oracle Support and make an appointment so that the drive can be replaced.
- F. Check the database to see if any rebalance operations are active.
Answer: E
Explanation:
According to the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book [1], before doing anything else you should call Oracle Support and make an appointment so that the drive can be replaced. If Platinum Support is enabled, then you can call Oracle Support and they will arrange for the disk to be replaced. If Platinum Support is not enabled, then you can arrange for the disk to be replaced through Enterprise Manager Cloud Control.
NEW QUESTION # 32
You want to monitor how a large production table is accessed. Especially, you are interested to see how the access on that particular table leverages the benefits of the Exadata Platform.
Which two actions are NOT appropriate for that purpose?
- A. YOU query VSSYSTEM_EVENTS and filter for the event 'cell physical IO interconnect bytes returned by smart scan', associated to your table.
- B. You query v$SYSTAT and filter for the statistic 'cell smart table scan', associated to your table.
- C. You run the CellCli-command list activerequest , filtering for the attributes ioReason and objectNumber, that you specify as 'Smart Scan' and the Object ID of your table from DBA_OBJECTS.
- D. You query v$segment_statistics and filter for the Object ID of your table from dba_objects and the the column STATISTIC_NAME='optimized physical reads'.
Answer: A,D
Explanation:
The two actions that are not appropriate for monitoring how a large production table is accessed in order to leverage the benefits of the Exadata Platform are A) querying VSSYSTEMEVENTS and filtering for the event 'cell physical IO interconnect bytes returned by smart scan', associated to your table; and B) querying v$segmentstatistics and filtering for the Object ID of your table from dbaobjects and the the column STATISTICNAME='optimized physical reads'. Instead, you should query v$SYSTAT and filter for the statistic 'cell smart table scan', associated to your table (C), or run the CellCli-command list activerequest, filtering for the attributes ioReason and objectNumber, that you specify as 'Smart Scan' and the Object ID of your table from DBA_OBJECTS (D). These two methods are outlined in the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book (Chapter 8, Monitoring the Exadata Database Machine).
NEW QUESTION # 33
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 copies redo log data from disk for faster redo apply on Data Guard Standby Databases.
- C. Persistent Memory Commit Accelerator helps to further reduce redo log write latency by using Persistent Memory and Remote Direct Memory Access (RDMA).
- D. Persistent Memory Commit Accelerator tracks changes to Persistent Memory Data Accelerator to ensure duplicate blocks are not written to Flash.
- E. Persistent Memory Commit Accelerator contains logging information from all tiers of the software stack for rapid triage and diagnostics.
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 # 34
Which two statements are true about the types of Exadata X9M-2 storage servers: the High Capacity (HC) storage server, the Extreme Flash (EF) storage server and the Extended server?
- A. The EF storage server contains 8 x 6.4 TB PCIe flash cards and 756 GB Persistent Memory.
- B. The EF storage server contains 8 x 6.4 TB PCIe flash cards.
- C. The HC storage server contains 12 x 18 TB hard disks, 4 x 6.4 TB PCIe flash cards, and 1.5 TB Persistent Memory.
- D. The EF storage server contains 8 x 6.4 TB PCIe flash cards, and can be upgraded with 4 more for a total of 12.
- E. The XT storage server is an all-disk storage server with no flash, containing 12 x 18 TB hard disks, and 1.5 TB Persistent Memory.
Answer: A,C
Explanation:
High Capacity (HC) Storage Server: The Exadata X9M-2 HC storage server is configured with a combination of hard disks and flash memory, providing a balance of storage capacity and performance.
It includes 12 x 18 TB hard disk drives, which totals 216 TB of raw disk capacity.
For flash storage, it has 4 x 6.4 TB PCIe flash cards totaling 25.6 TB of flash storage. This configuration uses NVMe Flash Accelerator F680 cards optimized for database caching.
The persistent memory in the HC server totals 1.5 TB, enhancing performance for OLTP (Online Transaction Processing) workloads by providing ultra-fast access speeds compared to traditional flash storage.
Extreme Flash (EF) Storage Server: The EF storage server in the Exadata X9M-2 model is an all-flash storage server designed for high IOPS and low latency, making it ideal for performance-intensive workloads.
This configuration contains 8 x 6.4 TB PCIe flash cards, providing a raw capacity of 51.2 TB of high-performance flash storage.
In terms of persistent memory, it includes 756 GB of Intel Optane Persistent Memory. This enhances flash storage performance by offloading data processing directly to persistent memory.
The Exadata X9M-2 storage configurations-both HC and EF-are optimized for different workload requirements. The HC configuration caters to larger datasets needing high storage capacity, while the EF configuration is designed for workloads requiring high throughput and minimal latency.
NEW QUESTION # 35
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. ZFSSA may connect directly to the Exadata 100Gb RoCE network switches.
- C. ZFS Snapshots can provide rapid cloning of development and test environment.
- D. When backing up multi-rack systems, sharing Exadata X9M switches is recommended.
Answer: B,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.
NEW QUESTION # 36
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. Even if the backup was limited to writing to four tape drives, eight channels could be specified to expedite the restore process.
- C. 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.
- D. 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.
Answer: A,D
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 # 37
You are planning the monitoring configuration for your Exadata X9M Database Machine.
Which three components are monitored directly through the use of Exadata-specific Enterprise Manager Plug-Ins?
- A. the RDMA over Converged Ethernet (RoCE) switches
- B. the Power Distribution Units (PDUs)
- C. the storage server ILOM
- D. Hybrid Columnar Compression (HCC) ratios on Extended (XT) storage servers
- E. Oracle clusterware on the database server
- F. ASM instances
Answer: C,E,F
NEW QUESTION # 38
Which dbmcli command is NOT valid on Exadata X9M?
- A. dbmcli -e "LIST METRICHISTORY WHERE name LIKE 'DS_.*'"
- B. dbmcli -e "LIST METRICCURRENT WHERE name = 'DS_TEMP' "
- C. dbmcli -e "LIST ALERTHISTORY WHERE agelnMinutes < 15"
- D. dbmcli -e "LIST IBPORT DETAIL"
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 # 39
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 "create threshold ds_temp comparison='>', critical=30" on each database server
- B. dbmcli -e "set alert ds_temp> 30" on each database server
- C. dbmcli -e "set threshold ds_temp comparison=' >', critical=30" on each database server
- D. dbmcli -e "alert metriccurrent ds_temp where metricValue > 30" on each database server
Answer: A
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 # 40
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 at least two storage servers in both racks
- B. on all database servers in the second rack
- C. on all database servers in the first rack
- D. on all storage servers in both racks
- E. on all database servers in both racks and one storage server in each rack
- F. on all database servers and at least two storage servers in both racks
- G. on only one database server in both racks
Answer: A,F
Explanation:
In order to monitor all components of this multirack configuration, Enterprise Manager agents must be deployed on at least two storage servers in both racks and all database servers in both racks. This is according to the Oracle Exadata Database Machine X9M Implementation Essentials official text book [1], in which it states "To monitor all components of the multirack configuration, you must deploy agents on all database servers and at least two storage servers in each rack" (page 6-15).
NEW QUESTION # 41
You want to monitor how a large production table is accessed. Especially, you are interested to see how the access on that particular table leverages the benefits of the Exadata Platform.
Which two actions are NOT appropriate for that purpose?
- A. YOU query VSSYSTEM_EVENTS and filter for the event 'cell physical IO interconnect bytes returned by smart scan', associated to your table.
- B. You query v$segment_statistics and filter for the Object ID of your table from dba_objects and the the column STATISTIC_NAME='optimized physical reads'.
- C. You run the CellCli-command list activerequest , filtering for the attributes ioReason and objectNumber, that you specify as 'Smart Scan' and the Object ID of your table from DBA_OBJECTS.
- D. You query v$SYSTAT and filter for the statistic 'cell smart table scan', associated to your table.
Answer: A,D
Explanation:
1. YOU query VSSYSTEM_EVENTS and filter for the event 'cell physical IO interconnect bytes returned by smart scan', associated to your table. This does not show how much data was filtered by Smart Scan, but only how much data was returned after Smart Scan12.
2. You query v$SYSTAT and filter for the statistic 'cell smart table scan', associated to your table. This does not show how much data was filtered by Smart Scan for a specific table, but only for all tables in a session12.
https://www.databasejournal.com/oracle/monitoring-smart-scans-in-oracle-exadata/
NEW QUESTION # 42
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. A splitter cable can be used to provide power to all PDU cables.
- B. The installation cannot proceed until two power feeds are available per PDU.
- 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 can go ahead, no change is required.
Answer: B
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.
The installation cannot proceed until two power feeds are available per PDU. According to the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book [1][2], it is recommended that each PDU should have at least two power feeds from different power sources in the data center. This is to ensure redundancy and avoid any power interruption due to power failure on one of the power sources. Splitter cables are not recommended, as they can reduce efficiency and increase the risk of overheating. Rearranging the power cables within the rack is not recommended either, as it does not provide the necessary redundancy for the PDU.
NEW QUESTION # 43
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. Remove existing memory modules.
- B. Add 12x 64GB DIMMs.
- C. Shutdown the Database Server if running.
- D. Add 16x 64GB DIMMs.
- E. Add 12x 32GB DIMMs.
- F. Add 32x 64GB DIMMs.
- G. Add 16x 32GB DIMMs.
- H. Add 24x 32GB DIMMs.
- I. Memory cannot be expanded on Exadata X9M-2 Database Servers.
Answer: A,C,F
Explanation:
https://www.oracle.com/a/ocom/docs/engineered-systems/exadata/exadata-x9m-2-ds.pdf
https://chriscraftoracle.wordpress.com/2022/11/09/what-makes-exadata-faster/
NEW QUESTION # 44
You want to monitor how a large production table is accessed. Especially, you are interested to see how the access on that particular table leverages the benefits of the Exadata Platform.
Which two actions are NOT appropriate for that purpose?
- A. YOU query VSSYSTEM_EVENTS and filter for the event 'cell physical IO interconnect bytes returned by smart scan', associated to your table.
- B. You query v$SYSTAT and filter for the statistic 'cell smart table scan', associated to your table.
- C. You run the CellCli-command list activerequest , filtering for the attributes ioReason and objectNumber, that you specify as 'Smart Scan' and the Object ID of your table from DBA_OBJECTS.
- D. You query v$segment_statistics and filter for the Object ID of your table from dba_objects and the the column STATISTIC_NAME='optimized physical reads'.
Answer: A,D
NEW QUESTION # 45
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. Identify the griddisks located on the failed physical disk and drop them from the associated ASM diskgroups.
- B. Verify that the griddisks located on the physical disk have been successfully dropped from the associated ASM diskgroups.
- C. Replace the failed physical disk.
- D. Create a new celldisk and new griddisks on the replaced physical disk.
- E. Add the griddisks back into the ASM diskgroup they used to be a member of.
- F. Rebalance the data on the effected griddisks before performing a manual drop command.
Answer: A,C
Explanation:
Once the physical disk has been replaced, you will need to create a new celldisk and griddisks on the replaced physical disk. After the griddisks have been dropped from the associated ASM diskgroups, you can then add the griddisks back into the ASM diskgroup they used to be a member of and rebalance the data on the effected griddisks. Finally, you should verify that the griddisks located on the physical disk have been successfully dropped from the associated ASM diskgroups.
NEW QUESTION # 46
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
NEW QUESTION # 47
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. $ ${ORACLE_HOME}/suptools/tfa/release/tfa_home/bin/tfact1 -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. # /opt/oracle.ExaWatcher/GetExaWatcherResults.sh -from <Fridays_Date>_17:00:00 -to <Sundays_Date>_23:59:00
Answer: D
Explanation:
AccordingtoOraclesdocumentationoneoftheutilitiesfordiagnosticsand
Explanation:
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
NEW QUESTION # 48
Which four actions should you take before proceeding with applying updates to your Exadata Database Machine?
- A. Check the Exadata Critical Issues My Oracle Support note 1270094.1 for any issues not added to the latest version of exachk.
- B. For database servers, perform a server backup using patchmgr -dbnodes db_list_file -backup -rolling.
- C. Run exachk and resolve only WARNINGS that you have not seen before.
- D. Consult My Oracle Support note 888828.1 to determine the current recommended Exadata software release.
- E. Run the appropriate patchmgr preqequisite check step for each component being updated.
- F. Run patchmgr --all_comp -autofix -autobackup -upgrade -rolling.
Answer: B,D,E,F
NEW QUESTION # 49
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 physicaldisk attributes name, deviceName, diskType, physicalFirmware
- B. list celldisk attributes name, deviceName, diskType, physicalFirmware
- C. list cell attributes name, deviceName, diskType, physicalFirmware
- D. list devices attributes name, deviceName, diskType, physicalFirmware
Answer: B
NEW QUESTION # 50
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