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Oracle9i program with pl/sql Sample Questions:

1. You need to implement a virtual private database (vpd). In order to have the vpd functionality, a trigger is required to fire when every user initiates a session in the database.What type of trigger needs to be created?

A) DML trigger
B) Application trigger
C) INSTEAD OF trigger
D) System event trigger

2. Which statement is true?

A) Stored functions can be called from the SELECT and WHERE clauses only.
B) Stored functions can increase the efficiency of queries by performing functions in the query rather than in the application.
C) Stored functions do not permit calculations that involve database links in a distributed environment.
D) Stored functions cannot manipulate new types of data, such as longitude and latitude.

3. The add_player procedure inserts rows into the PLAYER table. Which command will show this directory dependency?

A) SELECT * FROM USER DEPENDENCIES WHERE REFERENCED_NAME = 'TABLE';
B) SELECT * FROM USER DEPENDENCIES WHERE REFERENCED_NAME = 'ADD_PLAYER';
C) SELECT * FROM USER_DEPENDENCIES WHERE TYPE = 'DIR';
D) SELECT * FROM USER_DEPENDENCIES WHERE REFERENCED_NAME = 'PLAYER';

4. Examine the trigger:
CREATE OR REPLACE TRIGGER Emp_count
AFTER DELETE ON Emp_tab
FOR EACH ROW
DELCARE
n INTEGER;
BEGIN
SELECT COUNT(*)
INTO n
FROM Emp_tab;
DBMS_OUTPUT.PUT_LINE(' There are now ' || a ||
' employees,');
END;
This trigger results in an error after this SQL statement is entered:
DELETE FROM Emp_tab WHERE Empno = 7499;
How do you correct the error?

A) Change the trigger type to a BEFORE DELETE.
B) Remove the DBMS_OUTPUT statement because it is not allowed in a trigger.
C) Change the trigger to a statement-level trigger by removing FOR EACH ROW.
D) Take out the COUNT function because it is not allowed in a trigger.

5. Why do you use an INSTEAD OF trigger?

A) To insert into an audit table when data is updated in a sensitive column.
B) To modify data in which the DML statement has been issued against an inherently nonupdateable view.
C) To perform clean up actions when ending a user session.
D) To insert data into a view that normally does not accept inserts.

Solutions: