Authentic 1z1-902 Dumps - Free PDF Questions to Pass
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Oracle 1Z0-902 (Oracle Exadata Database Machine X8M Implementation Essentials) certification exam is designed for professionals who want to prove their expertise in implementing and managing Oracle Exadata Database Machine X8M systems. 1z1-902 exam assesses the candidate's knowledge and skills in areas such as Exadata deployment and configuration, storage management, backup and recovery, and database administration. Successful completion of 1z1-902 exam leads to the Oracle Certified Specialist credential.
NEW QUESTION # 34
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, 2, 1, 8, 4, 5
- B. 6, 3, 1, 9, 7, 8
- C. 6, 8, 3, 4, 2, 1
- D. 6, 1, 2, 7, 5, 8
Answer: B
NEW QUESTION # 35
Which two statements are true about enabling write-back flash cache?
- A. When enabling write-back flash cache in a non-rolling manner, you need to drop the Persistent Memory Commit Accelerator (PMEMLog) first.
- B. Write-back flash cache is on by default for High Capacity Storage Servers in High Redundancy configurations.
- C. Before write-back flash cache is enabled, you need to drop the Flash Cache first.
- D. Write-back Flash Cache cannot be used on Extreme Flash Storage Servers.
- E. When enabling write-back flash cache in a rolling manner, DBCLI should be used to inactivate the grid disks on all cells first.
Answer: B,C
Explanation:
According to the Oracle documentation1, two statements that are true about enabling write-back flash cache are:
Write-back flash cache is on by default for High Capacity Storage Servers in High Redundancy configurations (A). This is because write-back flash cache provides better performance and reliability for data file writes than write-through flash cache.
Before write-back flash cache is enabled, you need to drop the Flash Cache first (D). This is because changing the flash cache mode requires recreating the flash cache with a different configuration.
NEW QUESTION # 36
Which two statements are true about applying updates on Exadata systems?
- A. Failed database server updates are rolled back to a working state on a previous release automatically.
- B. Updating kernel and RDMA packages on storage cells should be prevented by excluding them with the yum -exclude option.
- C. To speed up applying storage server updates in a rolling manner, updating two storage servers simultaneously is recommended.
- D. For regular Exadata updates, yum automatically installs a non-UEK kernel, which can be selected to boot from grub.
- E. When running a "yum update" for a new Exadata release, all other repositories should be disabled.
- F. Failed storage server updates are automatically rolled back to a previous release.
Answer: E,F
Explanation:
According to Oracle's documentation12, some of the statements that are true about applying updates on Exadata systems are:
Failed storage server updates are automatically rolled back to a previous release1.
When running a "yum update" for a new Exadata release, all other repositories should be disabled1.
NEW QUESTION # 37
You have a script with several CELLCLI commands that must be executed on each cell in your Exadata full rack. The script must run on each cell simultaneously. How must you achieve this?
- A. Copy the script to all storage servers using the CELLCLI command and execute it on all storage servers in parallel using the CELLCLI command.
- B. Copy the script to all storage servers using the dcli command and manually execute it on all storage servers using the EXACLI command.
- C. Copy and execute the script on all storage servers using the EXACLI command.
- D. Copy and execute the script on all storage servers using the dcli command.
- E. Copy the script to all storage servers using the dcli command and manually execute it on each storage server using the DCLI command.
Answer: C
NEW QUESTION # 38
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.
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 # 39
Which are three customer options for hosting the Platinum Services Advanced Support Gateway?
- A. Install in Oracle Virtual Machine with required hardware.
- B. Install on Exadata Engineered System.
- C. Provide individual x86 64-Bit gateway hardware.
- D. Install on Oracle Database Appliance.
- E. Purchase the recommended x86 64-Bit gateway hardware from Oracle.
Answer: C,D,E
Explanation:
According to Oracle's documentation1, the customer options for hosting the Platinum Services Advanced Support Gateway are:
Provide individual x86 64-Bit gateway hardware1
Purchase the recommended x86 64-Bit gateway hardware from Oracle1
Install on Oracle Database Appliance2
NEW QUESTION # 40
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 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
- B. 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
- C. 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
- D. 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
Answer: A,B
NEW QUESTION # 41
Which statement is true about the Persistent Memory Commit Accelerator?
- A. Persistent Memory Commit Accelerator tracks changes to Persistent Memory Data Accelerator to ensure duplicate blocks are not written to Flash.
- B. Persistent Memory Commit Accelerator reduces redo log write latency by using Persistent Memory and RDMA before flushing to Flash then disk.
- 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 copies redo log data from disk for faster redo apply on Data Guard Standby Databases.
- E. Persistent Memory Commit Accelerator contains logging information from all tiers of the software stack for rapid triage and diagnostics.
Answer: C
Explanation:
https://docs.oracle.com/en/engineered-systems/exadata-database-machine/dbmso/new-features-exadata-system-software-release-23.html
NEW QUESTION # 42
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 cannot apply updates in a rolling manner, you must manually apply patches with the dbnodeudpate and cellupdate tools if high availability is required.
- C. patchmgr must be invoked with the -rolling argument with all database and storage servers listed in a single input file.
- 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 # 43
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. To see Oracle Linux boot messages during guest startup, use -console option with the vm_maker -start-domain command.
- C. Use vm_maker boot-from-iso command to boot a virtual machine.
- D. Use vm_maker -auto-start command to configure a virtual machine to start automatically when the KVM host is started.
- E. To streamline the diagnosis of virtual machines, one ISO file is used for multiple Oracle Exadata System Software releases.
Answer: C,D
NEW QUESTION # 44
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. 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
- B. OS I/O metrics using OS tools such as iostat on the database servers
- C. OS I/O metrics using Enterprise Manager host pages for the storage servers
- 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 storage servers
Answer: C,D
Explanation:
1. OS I/O metrics using Enterprise Manager host pages for the storage servers: Enterprise Manager provides a detailed view of the storage server's performance including I/O metrics and statistics. You can use these metrics to analyze I/O performance and identify any bottlenecks.
2. cellcli (or exacli/exadcli) to examine storage server metrics such as database, category, ceiidisk, and griddisk: These commands are used to gather information about storage server performance, including I/O statistics, disk usage, and resource allocation.
NEW QUESTION # 45
You are working on a remote Exadata Database Machine with current software and firmware. You now need to start a storage server after hardware maintenance.
Which ILOM command starts the storage server?
- A. -> start /SYS/power
- B. -> set /SYS power_state=ON
- C. -> start /SYSTEM/power
- D. -> start /System
- E. -> start /SP/console
- F. You must be physically present in the data center to start an Exadata Storage Server.
Answer: D
NEW QUESTION # 46
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 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
- B. 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
- C. 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
- D. 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
Answer: A,B
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 # 47
You have a script with several CELLCLI commands that must be executed on each cell in your Exadata full rack. The script must run on each cell simultaneously. How must you achieve this?
- A. Copy and execute the script on all storage servers using the EXACLI command.
- B. Copy the script to all storage servers using the CELLCLI command and execute it on all storage servers in parallel using the CELLCLI command.
- C. Copy and execute the script on all storage servers using the dcli command.
- D. Copy the script to all storage servers using the dcli command and manually execute it on all storage servers using the EXACLI command.
- E. Copy the script to all storage servers using the dcli command and manually execute it on each storage server using the DCLI command.
Answer: C
NEW QUESTION # 48
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 Databases on a cluster
- D. A single database with one or more schema per application
- E. Multiple pluggable databases in one or more container databases on a Virtual Machine or Bare Metal cluster
- F. Multiple databases spanning a Bare Metal and Virtual Machine cluster to provide resource isolation and consolidation concurrently
Answer: C,D,E
Explanation:
According to Oracle.com documents or resources, the three options that are available for database consolidation on Exadata are:
A) Multiple pluggable databases in one or more container databases on a Virtual Machine or Bare Metal cluster123.
C) A single database with one or more schema per application12.
E) Multiple Databases on a cluster12.
https://blogs.oracle.com/exadata/post/database-consolidation-why-and-how
NEW QUESTION # 49
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. 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. Even if the backup was limited to writing to four tape drives, eight channels could be specified to expedite the restore process.
Answer: B,C
Explanation:
According to the Oracle Exadata Database Machine documentation12, two recommended configuration best practices for backup and recovery on Exadata are:
1. 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.
2. 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.
NEW QUESTION # 50
Which two statements are true about Auto Service Request (ASR) with an Exadata Database Machine?
- A. ASR communicates with Oracle support services using HTTPS.
- B. ASR Manager must be installed and configured on a dedicated server external to the Database Machine.
- C. ASR can upload configuration metadata to support problem resolution.
- D. ASR Manager must be installed and configured on one of the database servers.
- E. ASR Manager opens a service request (SR) automatically after sensors detect hardware faults.
- F. Configuring ASR is mandatory for all Database Machine assets.
Answer: A,B
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 # 51
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. 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.
- D. 2, 3, 4, 8, and 10 run on the database servers; 1, 5, 6, 7and 9 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: C
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 # 52
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 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
- B. 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
- C. 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
- D. 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
Answer: A,C
Explanation:
https://www.oracle.com/a/ocom/docs/engineered-systems/exadata/exadata-x9m-2-ds.pdf
NEW QUESTION # 53
Which two statements are true about enabling write-back flash cache?
- A. Write-back Flash Cache cannot be used on Extreme Flash Storage Servers.
- B. Before write-back flash cache is enabled, you need to drop the Flash Cache first.
- C. When enabling write-back flash cache in a non-rolling manner, you need to drop the Persistent Memory Commit Accelerator (PMEMLog) first.
- D. When enabling write-back flash cache in a rolling manner, DBCLI should be used to inactivate the grid disks on all cells first.
- E. Write-back flash cache is on by default for High Capacity Storage Servers in High Redundancy configurations.
Answer: C,D
Explanation:
When enabling write-back flash cache in a rolling manner, it is important to use DBCLI to inactivate the grid disks on all cells first so that all the cells are in the same state before the process is started. In a non-rolling manner, you must drop the Persistent Memory Commit Accelerator (PMEMLog) first. Write-back flash cache is not on by default for High Capacity Storage Servers in High Redundancy configurations and can be used on Extreme Flash Storage Servers. It's also important to check if it's necessary to drop the flash cache before enabling write-back flash cache.
NEW QUESTION # 54
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. Oracle clusterware on the database server
- D. the storage server ILOM
- E. Hybrid Columnar Compression (HCC) ratios on Extended (XT) storage servers
- F. ASM instances
Answer: C,E,F
Explanation:
Exadata-specific Enterprise Manager Plug-Ins are used to monitor different components of the Exadata Database Machine.
1. ASM instances: The Automatic Storage Management (ASM) instances can be monitored directly through the use of Exadata-specific Enterprise Manager Plug-Ins. This allows you to monitor the storage space, disk usage, and performance of the ASM instances.
2. Hybrid Columnar Compression (HCC) ratios on Extended (XT) storage servers: The HCC ratios on Extended (XT) storage servers can be monitored directly through the use of Exadata-specific Enterprise Manager Plug-Ins. This allows you to monitor the compression ratios and performance of the storage servers.
3. Oracle clusterware on the database server: The Oracle clusterware on the database server can be monitored directly through the use of Exadata-specific Enterprise Manager Plug-Ins. This allows you to monitor the health and performance of the clusterware.
NEW QUESTION # 55
You are in the process of upgrading your nonvirtualized X9M-2 Database Machine elastic configuration with 4 database servers and 7 HC storage servers with an additional 4 database servers and 7 HC storage servers.
The new storage servers are called DM01CEL08 through dmoicel14.
After creating 96 new griddisks, you issued this SQL statement:
How many failgroups if any, will be added to the DATE diskgroup by executing this SQL statement?
- A. 7 consisting of 12 griddisks each
- B. 96 consisting of one griddisk each
- C. 12 consisting of seven griddisks each
- D. 0 because the new griddisks will be added to the existing faiigroups
- E. 1 consisting of all 96 griddisks
Answer: C
NEW QUESTION # 56
Which dbmcli command is NOT valid on Exadata X9M?
- A. dbmcli -e "LIST METRICCURRENT WHERE name = 'DS_TEMP' "
- B. dbmcli -e "LIST IBPORT DETAIL"
- C. dbmcli -e "LIST ALERTHISTORY WHERE agelnMinutes < 15"
- D. dbmcli -e "LIST METRICHISTORY WHERE name LIKE 'DS_.*'"
Answer: B
Explanation:
The dbmcli -e "LIST IBPORT DETAIL" command is not valid on Exadata X9M. According to the Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book [1][2], this command is only valid on Exadata X3 and X4 models. The other three commands are valid on Exadata X9M.
https://forums.oracle.com/ords/apexds/map/tech/apps-infra/discussion/4342715/monitoring-roce-performance
NEW QUESTION # 57
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