Most Recent Oracle 1Z0-497 Exam Questions & Answers

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The questions for 1Z0-497 were last updated on Dec 20, 2024.

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Question No. 1

Why does performance degrade when many UPDATE, INSERT, or DELETEstatements are issued on a table that has an associated bitmap index?

AThe DML operations re-create the bitmap index blocks.

BThe bitmap index is rebuilt automatically after a DML operation.

CThe smallest amount of a bitmap that can be locked is a bitmap segment.

DAdditional time is taken to remove NULL values from the bitmap index alter a DML operation.

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Correct Answer: C

Bitmap indexes in currently ''supported'' versions of Oracle are maintained in a much more efficient manner than they were previously, to the point where the need for frequently rebuilds has been much reduced, even in tables in which such indexes are not dropped during heavy loads.

That said, Bitmap indexes are still unsuitable in OLTP type environments (even in 11g or later) due to the locking implications associated with them.

Note: bitmap indexes are only suitable for static tables and materialized views which are updated at nigh and rebuilt after batch row loading.

Not B: Like b-tree indexes, bitmap indexes should be rebuilt (ALTER INDEX . . . REBUILD) if there is a lot of DML (UPDATE, INSERT, DELETE) activity.

Not A: Since 10g,Oracle issignificantly more efficient and where possible will simply adjust the current rowidrange of the Bitmap index entry and modify the bitmap string accordingly to accommodatea new row value (resulting in an overall increase of just 2 bytes overall in this example) rather than create a totally new index entry (which required an additional 21 bytes in the 9i example).

Question No. 2

Which two statements about multitenant architecture are true?

AIt ensures full backward compatibility with non-CDBs.

BIt fully operates with RAC .

CIt is integrated with Enterprise Manager, but not with the Resource Manager.

DIt allows central management and administration of single databases.

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Correct Answer: A, D

http://oracle-base.com/articles/12c/multitenant-resource-manager-cdb-and-pdb-12cr1.php

https://docs.oracle.com/database/121/RACAD/admcon.htm#RACAD8961

https://docs.oracle.com/database/121/BRADV/rcmrepai.htm#BRADV89725

Question No. 3

Which command do you use to check for block corruption by validating the database?

ARMAN> VALIDATE CHECK LOGICAL

BRMAN> VALIDATE BACKUP

CRMAN> VALIDATE CORRUPT BLOCKS

DRMAN> VALIDATE DATABASE

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Correct Answer: D

since 11g the syntax got changed to

RMAN> validate [check logical] database;

Example:

DGMGRL> validate database verbose d1

output include:

Block Corruptions found NO NO

Question No. 4

To revoke unnecessary and unused privileges, you can use Privilege Analysis. Which sequence should you follow?

1 -Start the analysis.

2 - Set up the analysis policy type (database, role, context).

3 - Generate the results.

4 -View the results in DBA_USED_PRIVSand DBA_UNUSED_PRJVS.

5 - Stop the analysis.

A1, 2, 3, 4, 5

B2, 1, 5, 3, 4

C5, 1, 2, 3, 4

D2, 3, I, 5, 4

E1, 2, 4, 5, 2

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Correct Answer: B

https://docs.oracle.com/database/121/DVADM/priv_analysis.htm#DVADM1005

Question No. 5

Identify two types of solutions in which you would need to use Active Data Guard and Golden Gate together.

Aa solution that provides zero-data-loss protection at any distance without impacting database performance

Ba solution for disaster protection and database rolling upgrades for a mission-critical OLTP database, where you also want to extract data from a data guard primary database for ETL update o' an enterprise data warehouse

Ca solution requiring minimal planned downtime and risk, using standby first patching, database rolling upgrades, and select platform migrations

Da solution that helps with integrated automatic database and client failover between source and target, where you also need to establish advanced replication (such as multi master and bidirectional replication and data transformations)

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Correct Answer: B, C

http://www.oracle.com/technetwork/database/availability/active-data-guard-wp-12c-1896127.pdf (page 16, last two bulleted points)

https://docs.oracle.com/database/121/UPGRD/deprecated.htm#UPGRD60084

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