1z0-062 sample questions

Question 1

Examine the parameters for your database instance below. You execute the following command: SQL> ALTER TABLESPACE undotbs1 RETENTION NOGUARANTEE; Which statement is true in this scenario?

Accepted Answer

An attempt is made to keep inactive undo for 1200 seconds but transactions may overwrite the undo before that time has elapsed.

Answer

Undo data is written to flashback logs after 1200 seconds.

Answer

Inactive undo data is retained for 1200 seconds even if subsequent transactions fail due to lack of space in the undo tablespace.

Answer

You can perform a Flashback Database operation only within the duration of 1200 seconds.

Question 2

A user establishes a connection to a database instance by using an Oracle Net connection. You want to ensure the following:

The user account must be locked after five unsuccessful login attempts.
Data read per session must be limited for the user.
The user cannot have more than three simultaneous sessions.
The user must have a maximum of 10 minutes session idle time before being logged off automatically.

How would you accomplish this?

Accepted Answer

by assigning a profile to the user

Answer

by granting a secure application role to the user

Answer

by implementing Database Resource Manager

Answer

by using Oracle Label Security options

Question 3

As a user of the ORCL database, you establish a database link to the remote HQ database such that all users in the ORCL database may access tables only from the SCOTT schema in the HQ database. SCOTT’s password is TIGER. The service mane “HQ' is used to connect to the remote HQ database.

Which command would you execute to create the database link?

Accepted Answer

CREATE PUBLIC DATABASE LINK HQ CONNECT TO scott IDENTIFIED BY tiger USING 'HQ';

Answer

CREATE DATABASE LINK HQ USING 'HQ';

Answer

CREATE DATABASE LINK HQ CONNECT TO CURRENT_USER USING ‘HQ’;

Answer

CREATE DATABASE LINK HQ CONNECT TO scott IDENTIFIED BY tiger USING 'HQ';

Question 4

What happens if a maintenance window closes before a job that collects optimizer statistics completes?

Accepted Answer

The job is terminated and statistics for the remaining objects are collected the next time the maintenance window opens.

Answer

The job is terminated and the gathered statistics are not saved.

Answer

The job is terminated but the gathered statistics are not published.

Answer

The job continues to run until all statistics are gathered.

Question 5

You plan to create a database by using the Database Configuration Assistant (DBCA), with the following specifications:

Applications will connect to the database via a middle tier.
The number of concurrent user connections will be high.
The database will have mixed workload, with the execution of complex BI queries scheduled at night.

Which DBCA option must you choose to create the database?

Accepted Answer

a General Purpose database template, with the shared server mode option and Automatic Memory Management (AMM) enabled

Answer

a General Purpose database template with default memory allocation

Answer

a Data Warehouse database template, with the dedicated server mode option and AMM enabled

Answer

a default database configuration

Question 6

Which two statements are true about the logical storage structure of an Oracle database? (Choose two.)

Accepted Answer

It is possible to have tablespaces of different block sizes.

Accepted Answer

A data block is the smallest unit of I/O in data files.

Answer

An extent contains data blocks that are always physically contiguous on disk.

Answer

An extent can span multiple segments.

Answer

Each data block always corresponds to one operating system block.

Question 7

Which two statements correctly describe the relationship between data files and logical database structures? (Choose two.)

Accepted Answer

A data file can belong to only one tablespace.

Accepted Answer

An extent cannot span data files.

Answer

A segment cannot span data files.

Answer

The size of an Oracle data block in a data file should be the same as the size of an OS block.

Question 8

Which statement is true about the Log Writer process?

Accepted Answer

It writes when a user commits a transaction.

Answer

It writes when it receives a signal from the checkpoint process (CKPT).

Answer

It writes concurrently to all members of multiplexed redo log groups.

Answer

It writes after the Database Writer process writes dirty buffers to disk.

Question 9

The ORCL database is configured to support shared server mode. You want to ensure that a user connecting remotely to the database instance has a one-to-one ratio between client and server processes.

Which connection method guarantees that this requirement is met?

Accepted Answer

CREATE_SERVICE procedure and using this service for creating a local naming service

Answer

connecting by using an external naming method

Answer

connecting by using the easy connect method

Answer

creating a service in the database by using the DBMS_SERVIC

Answer

connecting by using the local naming method with the SERVER = DEDICATED parameter set in the tnsnames.ora file for the net service

Answer

connecting by using a directory naming method

Question 10

Which two tasks can be performed on an external table? (Choose two.)

Accepted Answer

creating a public synonym

Accepted Answer

creating a view

Answer

partitioning the table

Answer

creating an invisible index

Answer

updating the table by using an UPDATE statement

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