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最新的 Oracle Engineered Systems 1Z0-902 免費考試真題 (Q66-Q71):

問題 #66
Which two Exadata security features would you configure to control which databases can access which griddisks, when multiple databases share space on your storage servers in an unpartitioned storage grid?

• A. Exadata storage realms using ASM-scoped security mode
• B. Exadata storage realms using database-scoped security mode
• C. File permissions on the griddisks in each storage server
• D. File permissions on the griddisks in each database server
• E. Using EXADCLI instead of CELLCLI to create the griddisks

答案：C,E

 

問題 #67
Which two statements are true about enabling write-back flash cache?

• A. Write-back flash cache is on by default for High Capacity Storage Servers in High Redundancy configurations.
• B. Write-back Flash Cache cannot be used on Extreme Flash Storage Servers.
• C. Before write-back flash cache is enabled, you need to drop the Flash Cache 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. When enabling write-back flash cache in a non-rolling manner, you need to drop the Persistent Memory Commit Accelerator (PMEMLog) first.

答案：C,D

解題說明：
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".

 

問題 #68
Which two quarantine types can disable Smart Scan for multiple databases that offload SQL statements to a cell on an Exadata Database Machine?

• A. Disk Region Quarantine
• B. SQL Plan Quarantine
• C. Manually created Quarantine
• D. Database Quarantine
• E. Cell Offload Quarantine

答案：B,E

解題說明：
A and E are the two correct quarantine types that can disable Smart Scan for multiple databases that offload SQL statements to a cell on an Exadata Database Machine. A is correct because SQL Plan Quarantine will disable Smart Scan for all queries related to the SQL plan that was placed in the SQL Plan Quarantine [1]. E is correct because the Cell Offload Quarantine will disable Smart Scan for all queries offloaded to Oracle Database Exadata Storage Server Software [2]. The other statements (B, C, and D) are incorrect.
[1] Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book , Chapter 13 [1][2]: Oracle Database Exadata Storage Server Software [2] Oracle Exadata Database Machine X9M Implementation Essentials Official Text Book , Chapter 15 [1][2]: Oracle Database Exadata Storage Server Configuration
https://docs.oracle.com/en/engineered-systems/exadata-database-machine/sagug/exadata-storage-server-software-introduction.html

 

問題 #69
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 dcli command.
• B. Copy the script to all storage servers using the dcli command and manually execute it on each storage server using the DCLI command.
• C. Copy the script to all storage servers using the dcli command and manually execute it on all storage servers using the EXACLI command.
• D. Copy and execute the script on all storage servers using the EXACLI command.
• E. Copy the script to all storage servers using the CELLCLI command and execute it on all storage servers in parallel using the CELLCLI command.

答案：A

 

問題 #70
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'.

答案：A,B

解題說明：
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/

 

問題 #71
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