Practice Exam Questions For Oracle 1Z0-070

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Question No. 1

Which two are true about Smart Scan?

Answer: D, E

D: With Exadata storage, database operations are handled much more efficiently. Queries that perform table scans can be processed within Exadata storage with only the required subset of data returned to the database server. Row filtering, column filtering and some join processing (among other functions) are performed within the Exadata storage cells. When this takes place only the relevant and required data is returned to the database server.

E: With Smart Scan processing, row filtering, column filtering, some join processing, and other functions are performed in the Exadata cells.

References:

http://www.centroid.com/blog/exadata-smart-scan-processing


Question No. 2

You plan to monitor the ASM configuration on an X5 Database Machine as part of your role supporting Exadata-based ASM diskgroups.

You want to check for potential space problems that take ASM mirroring requirements into account.

Which two values would you monitor from V$ASM_DISKGROUP or by using the ASMCMD LSDG command?

Answer: B, D

Determine the Amount of Available Space

To increase the size of the disks in a disk group you must either have unallocated disk space available, or you have to reallocate space currently used by a different disk group.

Example: View the space currently used by the disk groups.

SELECT name, total_mb, free_mb, total_mb - free_mb used_mb, round(100*free_mb/total_mb,2) pct_free

FROM v$asm_diskgroup

ORDER BY 1;

The example above shows that the DATAC1 disk group has only about 15% of free space available while the RECOC1 disk group has about 87% free disk space. The PCT_FREE displayed here is raw free space, not usable free space. Additional space is needed for rebalancing operations.

References:

http://docs.oracle.com/cd/E80920_01/SAGUG/exadata-administering-asm.htm#SAGUG20526


Question No. 3

You plan to monitor the status of the motherboard, memory, power, fans, and network cards on the database nodes in your Exadata X6 Database Machine using Enterprise Manager.

Where must you set the thresholds for these hardware components and why, to assure that sensor readings, faults, and any related alerts, are visible in Enterprise Manager?

Answer: D

Question No. 4

Which two statements are true about Database Server Metrics and Alerts on an X5 Database Machine?

Answer: B, E

Question No. 5

Identify three valid configuration options that can be implemented during the initial configuration process of a new X5 Database Machine by using the Exadata Deployment Assistant.

Answer: A, C, D

Oracle Exadata Deployment Assistant has two main phases

Oracle Exadata Deployment Assistant can configure Oracle Exadata Database Machine, Recovery Appliance, or Oracle SuperCluster.

References:

https://docs.oracle.com/cd/E55822_01/AMOGD/configurator.htm#AMOGD22056

https://www.toadworld.com/platforms/oracle/w/wiki/11469.oracle-exadata-deployment-assistance-oeda


Question No. 6

You are evaluating the performance of a SQL statement that accesses a very large table.

You run this query:

Identify two reasons why the 'cell physical IO interconnect bytes' statistic is greater than the 'cell physical IO interconnect bytes returned by smart scan' statistic.

Answer: C, D

C: Scan on a clustered table can prevent a Smart Scan from occur.

D: Scan on an index-organized table can prevent a Smart Scan from occur.

Note: The Cell physical IO interconnect bytes returned by smart scan metric shows how many bytes of I/O were returned by a smart scan to the database server.

References:

https://uhesse.com/2011/01/19/exadata-part-i-smart-scan/


Question No. 7

You plan to migrate a database supporting an OLTP workload to your new X5 Database Machine.

The current database instance supports a large number of short duration sessions and a very high volume of short transactions.

Which three X5 Database Machine features can improve performance for this type of workload?

Answer: A, C, D

A: To further accelerate OLTP workloads, the Exadata Smart Flash Cache also implements a special algorithm to reduce the latency of log write I/Os called Exadata Smart Flash Logging.

C: Use the Write-Back Flash Cache feature to leverage the Exadata Flash hardware and make Exadata Database Machine a faster system for Oracle Database Deployments.

D: Exadata X5-2 introduces Extreme Flash Storage Servers. Each Extreme Flash storage server contains eight 1.6 TB state-of-the-art PCI Flash drives. PCI flash delivers ultra-high performance by placing flash memory directly on the high speed PCI bus rather than behind slow disk controllers and directors.

References:

http://www.oracle.com/technetwork/database/exadata/exadata-x5-2-ds-2406241.pdf

http://www.oracle.com/technetwork/articles/database/exadata-write-back-flash-2179184.html


Question No. 8

Which three factors should you consider when choosing a method for migrating a database to the X5 Database Machine?

Answer: B, D, E

B: Endian format: Non-Exadata format

D: Use Real Production Workload

-- Real Application Testing (RAT)


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