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Oracle9i program with pl/sql Sample Questions:

1. Which statement about triggers is true?

A) You use INSTEAD OF trigger to fire when a SELECT statement occurs.
B) You use a database trigger to fire when an INSERT statement occurs.
C) You use an application trigger to fire when a DELETE statement occurs.
D) You use a system event trigger to fire when an UPDATE statement occurs.

2. 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) INSTEAD OF trigger
B) DML trigger
C) System event trigger
D) Application trigger

3. When creating a function, in which section will you typically find the RETURN keyword?

A) EXECUTABLE and HEADER
B) DECLARATIVE
C) DECLARATIVE,EXECUTABLE and EXCEPTION HANDLING
D) HEADER only

4. What is true about stored procedures?

A) A stored procedure uses the DELCLARE keyword in the procedure specification to declare formal parameters.
B) A stored procedure is named PL/SQL block with at least one parameter declaration in the procedure specification.
C) A stored procedure uses the DECLARE keyword in the procedure body to declare formal parameters.
D) A stored procedure must have at least one executable statement in the procedure body.

5. Examine this code:
CREATE OR REPLACE PROCEDURE audit_action (p_who VARCHAR2) AS BEGIN INSERT INTO audit(schema_user) VALUES(p_who); END audit_action; /
CREATE OR REPLACE TRIGGER watch_it AFTER LOGON ON DATABASE CALL audit_action(ora_login_user) / What does this trigger do?

A) The trigger records an audit trail when a user makes changes to the database.
B) The trigger invoked the procedure audit_action each time a user logs on to his/her schema and adds the username to the audit table.
C) The trigger marks the user as logged on to the database before an audit statement is issued.
D) The trigger invokes the procedure audit_action each time a user logs on to the database and adds the username to the audit table.

Solutions: