Free Access Oracle.1Z0-082.v2022-03-27.q110 Practice Test (Page 8)

Question 31

Which three are true about the Oracle Optimizer? (Choose three.)

A.It can optimize only SELECT statements.

B.It determines the optimal table join order and method.

C.It updates stale object statistics in the Data Dictionary.

D.It can re-optimize execution plans after previous executions detect suboptimal plans.

E.It generates execution plans for SQL statements based on relevant schema objects, system and session parameters, and information found in the Data Dictionary.

F.It will only generate SQL Plan Directives specific to a given SQL statement.

Question 32

Your database instance is started with a PFILE.
Examine these parameters:

You want to increase the size of the buffer cache.
Free memory is available to increase the size of the buffer cache.
You execute the command:
SQL> ALTER SYSTEM SET DB_CACHE_SIZE=1024M;
What is the outcome?

A.The value is changed only in the PFILE and takes effect at the next instance startup

B.The value is changed for the current instance and in the PFILE

C.It fails because the SCOPE clause is missing

D.Change is applied to the current instance, but does not persist after instance restart

Question 33

Which three statements are true about advanced connection options supported by Oracle Net for connection to Oracle Database instances? (Choose three.)

A.Connect Time Failover requires the use of Transparent Application Failover (TAF)

B.Source Routing requires the use of a name server

C.Source Routing enables the use of Connection Manager (CMAN) which enables network traffic to be routed through a firewall

D.Load Balancing can balance the number of connections to dispatchers when using a Shared Server configuration

E.Load Balancing requires the use of a name server

F.Connect Time Failover requires the connect string to have two or more listener addresses configured

Question 34

Examine the description of the EMPLOYEES table:

Which query is valid?

A.SELECT dept_id, MAX(AVG(salary)) FROM employees GROUP BY dept_id;

B.SELECT dept_id, AVG(MAX(salary)) FROM employees GROUP BY dept_id;

C.SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id, join_date;

D.SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id;

Question 35

Examine the description of the BOOKS table:

The table has 100 rows.
Examine this sequence of statements issued in a new session:
INSERT INTO books VALUES ('ADV112', 'Adventures of Tom Sawyer', NULL, NULL); SAVEPOINT a; DELETE FROM books; ROLLBACK TO SAVEPOINT a; ROLLBACK; Which two statements are true? (Choose two.)

A.The second ROLLBACK command does nothing

B.The second ROLLBACK command replays the delete

C.The first ROLLBACK command restores the 101 rows that were deleted, leaving the inserted row still to be committed

D.The second ROLLBACK command undoes the insert

E.The first ROLLBACK command restores the 101 rows that were deleted and commits the inserted row

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Question 31

Question 32

Question 33

Question 34

Question 35

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