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Oracle Exadata Database Machine X8M Implementation Essentials Sample Questions (Q47-Q52):
NEW QUESTION # 47
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:
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$SYSTAT and filter for the statistic 'cell smart table scan', associated to your table. This does not show how much data was filtered by Smart Scan for a specific table, but only for all tables in a session12.
https://www.databasejournal.com/oracle/monitoring-smart-scans-in-oracle-exadata/
NEW QUESTION # 48
I/O performance of the prod database on your Exadata Database Machine has degraded slightly over the past month. The database has been allocated to the OLTP I/O Resource Management (IORM) category.
Which two monitoring tools might be useful in examining I/O performance for the prod database?
- A. OS I/O metrics using OS tools such as iostat on the database servers
- B. cellcli (or exacli/exadcli) to examine storage server metrics such as database, category, ceiidisk, and griddisk
- C. I/O-specific dynamic performance views such as v$iostat_fiie, v$iostat_function, and v$iostat_consumer_group from the prod
database instances using SQL *p1us
- D. OS I/O metrics using OS tools such as iostat on the storage servers
- E. OS I/O metrics using Enterprise Manager host pages for the storage servers
Answer: A,B
NEW QUESTION # 49
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 dcli command and manually execute it on each storage server using the DCLI 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 dcli command.
- D. Copy the script to all storage servers using the CELLCLI command and execute it on all storage servers in parallel using the CELLCLI command.
- E. Copy and execute the script on all storage servers using the EXACLI command.
Answer: C
Explanation:
According to Oracle's documentation1, the Cell Control Command-Line Interface (CellCLI) utility is the command-line administration tool for Oracle Exadata System Software. It can be used to perform various tasks on Exadata Storage Servers, such as creating and managing objects, monitoring performance, and configuring alerts.
To run CELLCLI commands on multiple cells simultaneously, you can use the Distributed Command-Line Interface (dcli) utility2. The dcli utility allows you to execute commands or scripts on a group of cells or hosts in parallel. You can use the dcli utility to copy files from one cell or host to multiple cells or hosts using the -f option3. You can also use the dcli utility to execute commands or scripts on multiple cells or hosts using the -l option to specify a user name and the -g option to specify a file containing a list of cells or hosts3.
Therefore, to achieve your requirement of running a script with several CELLCLI commands on each cell in your Exadata full rack simultaneously, you must:
Copy and execute the script on all storage servers using the dcli command.
NEW QUESTION # 50
Which two sections of the AWR report shows statistics for X9M Persistent Memory Cache?
- A. PMEM Pool cache Read Hits in the Cache Sizes portion of the Report Summary
- B. PMEM Cache section within Exadata Smart Statistics
- C. cell PMEM cache Read Hits in the Database IOs portion of the Performance Summary
- D. PMEM Cache section within Memory Statistics
- E. PMEM Pool Misses in the Exadata Outlier Summary
Answer: B,C
Explanation:
Option C shows the number of read hits from PMEM cache on storage servers which indicates how much data was served from PMEM instead of flash or disk1.
Option E shows detailed information about PMEM cache such as size, utilization, hit ratio, read latency and write latency2.
NEW QUESTION # 51
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$SYSTAT and filter for the statistic 'cell smart table scan', associated to your table.
- B. YOU query VSSYSTEM_EVENTS and filter for the event 'cell physical IO interconnect bytes returned by smart scan', associated to your table.
- C. You run the CellCli-command list activerequest , filtering for the attributes ioReason and objectNumber, that you specify as 'Smart Scan' and the Object ID of your table from DBA_OBJECTS.
- D. You query v$segment_statistics and filter for the Object ID of your table from dba_objects and the the column STATISTIC_NAME='optimized physical reads'.
Answer: B,D
NEW QUESTION # 52
......
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