1z0-062 sample questions

Question 1

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 2

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 3

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 4

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 5

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

Question 6

Which three statements are true about a job chain? (Choose three.)

Accepted Answer

It can contain a nested chain of jobs.

Accepted Answer

It can be used to implement dependency-based scheduling.

Accepted Answer

It can be executed using event-based or time-based schedules.

Answer

It cannot invoke the same program or nested chain in multiple steps in the chain.

Answer

It cannot have more than one dependency.

Question 7

The HR user receives the following error while inserting data into the sales table:

ERROR at line 1:
ORA-01653: unable to extend table HR.SALES by 128 in tablespace USERS

On investigation, you find that the users tablespace uses Automatic Segment Space Management (ASSM). It is the default tablespace for the HR user with an unlimited quota on it.

Which two methods would you use to resolve this error? (Choose two.)

Accepted Answer

Altering the data file associated with the USERS tablespace to extend automatically

Accepted Answer

Adding a data file to the USERS tablespace

Answer

Changing segment space management for the USERS tablespace to manual

Answer

Creating a new tablespace with autoextend enabled and changing the default tablespace of the HR user to the new tablespace

Answer

Enabling resumable space allocation by setting the RESUMABLE_TIMEOUT parameter to a nonzero value

Question 8

Which three factors influence the optimizer's choice of an execution plan? (Choose three.)

Accepted Answer

the optimizer_mode initialization parameter

Accepted Answer

cardinality estimates

Accepted Answer

object statistics in the data dictionary

Answer

operating system (OS) statistics

Answer

fixed baselines

Question 9

Examine the resources consumed by a database instance whose current Resource Manager plan is displayed. Which two statements are true? (Choose two.)

Accepted Answer

The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited for the CPU due to resource management.

Accepted Answer

A user belonging to the DSS__QUERIES resource consumer group can create a new session but the session will be queued.

Answer

An attempt to start a new session by a user belonging to DSS_QUERIES fails with an error.

Answer

An attempt to start a new session by a user belonging to OTHER_GROUPS fails with an error.

Answer

The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited for the CPU due to I/O waits and latch or enqueue contention.

Question 10

Which action takes place when a file checkpoint occurs?

Accepted Answer

All buffers for a checkpointed file that were modified before a specific SCN are written to disk by DBWn and the SCN is stored in the control file.

Answer

The checkpoint position is advanced in the checkpoint queue.

Answer

The Database Writer process (DBWn) writes all dirty buffers in the buffer cache to data files.

Answer

The Log Writer process (LGWR) writes all redo entries in the log buffer to online redo log files.

1z0-062 Sample Questions & Answers

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1z0-062 Sample Questions & Answers

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