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1z1-902 Valid Study Guide & Exam 1z1-902 Lab Questions

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Oracle Exadata Database Machine X8M Implementation Essentials Sample Questions (Q57-Q62):

NEW QUESTION # 57
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 alter GRIDDISK all inactive on the affected storage server
B. shutdown -h now' on the affected storage server
C. CeLLCLI> list GRIDDISK where status != 'inactive' on the affected storage server
D. 'crsct1 stop cluster -all' on one of the database servers
E. CeLLCLI> alter cell shutdown SERVICES all on the affected storage server
F. CellCLI LIST GRIDDISK ATTRIBUTES name WHERE asmdeactivationoutcome != 'Yes' on the affected Storage server

Answer: B

Explanation:
https://docs.oracle.com/en/engineered-systems/exadata-database-machine/dbmmn/maintaining-exadata-storage-servers.html#GUID-AE16A1DA-53C6-4E80-94E5-963AA65373AB

NEW QUESTION # 58
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. ASM instances
D. Hybrid Columnar Compression (HCC) ratios on Extended (XT) storage servers
E. Oracle clusterware on the database server
F. the storage server ILOM

Answer: A,B,F

Explanation:
According to Oracle's documentation12, the components that are monitored directly through the use of Exadata-specific Enterprise Manager Plug-Ins are:
The storage server ILOM2
The Power Distribution Units (PDUs)2
The RDMA over Converged Ethernet (RoCE) switches3

NEW QUESTION # 59
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 v$segment_statistics and filter for the Object ID of your table from dba_objects and the the column STATISTIC_NAME='optimized physical reads'.
B. You query v$SYSTAT and filter for the statistic 'cell smart table scan', associated to your table.
C. YOU query VSSYSTEM_EVENTS and filter for the event 'cell physical IO interconnect bytes returned by smart scan', associated to your table.
D. 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.

Answer: B,C

Explanation:
A) 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.
C) 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 # 60
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: C,E

Explanation:
The two statements that are true about enabling write-back flash cache are:
When enabling write-back flash cache in a rolling manner, DBCLI should be used to inactivate the grid disks on all cells first.
Before write-back flash cache is enabled, you need to drop the Flash Cache first.
The Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book states that "when enabling write-back flash cache in a rolling manner [1], grid disks need to be inactivated on all cells before enabling write-back flash cache". It also states that "before write-back flash cache can be enabled, the existing flash cache must be dropped".

NEW QUESTION # 61
Which two statements are correct about adding an additional database server to a physical Exadata X9M Database Machine using Oracle Exadata Deployment Assistant (OEDA)?

A. In order to configure the servers with Oracle Exadata Deployment Assistant (OEDA), the new server information must be entered in OEDA, and the configuration file must contain existing nodes.
B. Executing /opt/oracle.supportTools/reclaimdisks.sh -free -reclaim on each Exadata X9M Database server is required to reclaim disk space and perform partition reconfiguration.
C. It is required to install OEDA on the first new database server.
D. The applyElasticConfig.sh script performs network configuration for the new servers. The new servers are restarted at the end of the process.
E. Do not proceed if the OEDA Validate Configuration File step displays an error message about missing files p6880880.zip.

Answer: A,D

Explanation:
https://docs.oracle.com/en/database/oracle/oracle-database/21/ladbi/db-on-exadata.html

NEW QUESTION # 62
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