UpWork (oDesk) & Elance Oracle PL Test Question & Answers

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Ques : The oracle server implicitly opens a cursor to process:
Ans  :  A Sql select statement
       DML Statements

Ques : Which two among the following programming constructs can be grouped within a package?
Ans  : Constant
       Sequence

Ques : Which two statements, among the following, describe the state of a package variable after executing the package in which it is declared?
Ans  : It persists across transactions within a session
       It persists from session to session for the same user

Ques : Which of the following is not a legal declaration?
Ans  : declare x,y varchar2(10);
      declare Sex boolean:=1;
 
Ques : Which two statements out of the following regarding packages are true?
Ans  : The package specification is required, but the package body is optional
       The specification and body of the package are stored separately in the database
 
Ques : A table has to be dropped from within a stored procedure. How can this be implemented
Ans  : Use the DBMS_DDL packaged routines in the procedure to drop the table

Ques : CREATE OR REPLACE PACKAGE manage_emp IS
tax_rate CONSTANT NUMBER(5,2) := .28;
v_id NUMBER;
PROCEDURE insert_emp (p_deptno NUMBER, p_sal NUMBER);
PROCEDURE delete_emp;
PROCEDURE update_emp;
FUNCTION cal_tax (p_sal NUMBER) RETURN NUMBER;
END manage_emp;
/
CREATE OR REPLACE PACKAGE BODY manage_emp IS

PROCEDURE update_sal (p_raise_amt NUMBER) IS
BEGIN
UPDATE emp SET sal = (sal * p_raise_emt) + sal
WHERE empno = v_id;
END;

PROCEDURE insert_emp (p_deptno NUMBER, p_sal NUMBER) IS
BEGIN
INSERT INTO emp(empno, deptno, sal) VALUES
(v_id, p_depntno, p_sal);
END insert_emp;

PROCEDURE delete_emp IS
BEGIN
DELETE FROM emp WHERE empno = v_id;
END delete_emp;

PROCEDURE update_emp IS
v_sal NUMBER(10,2);
v_raise NUMBER(10, 2);
BEGIN
SELECT sal INTO v_sal FROM emp WHERE empno = v_id;
IF v_sal < 500 THEN v_raise := .05;
ELSIP v_sal < 1000 THEN v_raise := .07;
ELSE v_raise := .04;
END IF;
update_sal(v_raise);
END update_emp;

FUNCTION cal_tax (p_sal NUMBER)RETURN NUMBER IS
BEGIN
RETURN p_sal * tax_rate;
END cal_tax;
END manage_emp;
/
What is the name of the private procedure in this package?
Ans  : UPDATE_SAL

Ques : An internal LOB is _____.
Ans  : Stored in the database

Ques : The technique employed by the Oracle engine to protect table data, when several people are accessing it is called:
Ans  :  Concurrency Control

Ques : Which table should be queried to determine when the procedure was last compiled?
Ans  : USER_OBJECTS

Ques : Which cursor dynamically allows passing values to a cursor while opening another cursor?
Ans  : Implicit Cursor

Ques : Which precomplied word is called, which when encountered, immediately binds the numbered exception handler to a name?
Ans  : Exception_init

Ques : How can migration be done from a LONG to a LOB data type for a column?
Ans  : Using ALTER TABLE statement

Ques : Which table and column can be queried to see all procedures and functions that have been marked invalid?
Ans  : USER_OBJECTS table,STATUS column

Ques : In which type of trigger can the OLD and NEW qualifiers can be used?
Ans  : Row level DML trigger

Ques : Examine the following trigger:

CREATE OR REPLACE TRIGGER Emp_count
AFTER DELETE ON Employee
FOR EACH ROW
DECLARE
n INTEGER;
BEGIN
SELECT COUNT(*) INTO n FROM employee;
DMBS_OUTPUT.PUT_LINE( 'There are now' || n || 'employees');
END;

This trigger results in an error after this SQL statement is entered: DELETE FROM Employee WHERE Empno = 7499;
How should the error be corrected?
Ans  : Take out the COUNT function because it is not allowed in a trigger

Ques : Which Section deals with handling of errors that arise during execution of the data manipulation statements, which makeup the PL/SQL Block?
Ans  : Exception

Ques :  Which of the following statements is true?
Ans  :  Stored functions can increase the efficiency of queries by performing functions in the query rather than in the application

Ques :Examine the following code:
CREATE OR REPLACE FUNCTION gen_email (first_name VARCHAR2, last_name VARCHAR2,
id NUMBER)
RETURN VARCHAR2 IS
email_name VARCHAR2(19);
BEGIN
email_name := SUBSTR(first_name, 1, 1) ||
SUBSTR(last_name, 1, 7) ||.@Oracle.com .;
UPDATE employees SET email = email_name
WHERE employee_id = id;
RETURN email_name;
END;
Which of the following statements removes the function?
Ans  : DROP FUNCTION gen_email;

Ques : In Pl/Sql, if the where clause evaluates to a set of data, which lock is used?
Ans  :  Page Level lock

Ques : If user defined error condition exists,Which of the following statements made a call to that exception?
Ans  : Raise

Ques : Which of the following are identified by the "INSTEAD OF" clause in a trigger?
Ans  : The view associated with the trigger

Ques : What type of trigger is created on the EMP table that monitors every row that is changed, and places this information into the AUDIT_TABLE?
Ans  : FOR EACH ROW trigger on the EMP table

Ques : Which procedure is called after a row has been fetched to transfer the value, from the select list of the cursor into a local variable?
Ans  :  Row_value

Ques : What is the maximum number of handlers processed before the PL/SQL block is exited, when an exception occurs?
Ans  : Only one

Ques : When the procedure or function is invoked, the Oracle engine loads the compiled procedure or function in the memory area called:
Ans  : PGA

Ques : What happens during the execute phase with dynamic SQL for INSERT, UPDATE, and DELETE operations?
Ans  : The area of memory established to process the SQL statement is released

Ques : Examine the following package specification:
CREATE OR REPLACE PACKAGE combine_all
IS
v_string VARCHAR2(100);
PROCEDURE combine (p_num_val NUMBER);
PROCEDURE combine (p_date_val DATE);
PROCEDURE combine (p_char_val VARCHAR2, p_num_val NUMBER);
END combine_all;
/
Which overloaded COMBINE procedure declaration can be added to this package specification?
Ans  :  PROCEDURE combine;

Ques : Which part of a database trigger determines the number of times the trigger body executes?
Ans  : Trigger type

Ques : Which table should be queried to check the status of a function?
Ans  : USER_OBJECTS

Ques : Which of the following statements is true regarding stored procedures?
Ans  :  A stored procedure must have at least one executable statement in the procedure body

Ques : Examine the following code:
CREATE OR REPLACE TRIGGER secure_emp
BEFORE LOGON ON employees
BEGIN
IF (TO_CHAR(SYSDATE, 'DY') IN ('SAT', 'SUN')) OR
(TO_CHAR(SYSDATE, 'HH24:MI')
NOT BETWEEN '08:00' AND '18:00')
THEN RAISE_APPLICATION_ERROR (-20500, 'You may
insert into the EMPLOYEES table only during
business hours.');
END IF;
END;
/
What type of trigger is it?
Ans  : This is an invalid trigger

Ques : Which code is stored in the database when a procedure or function is created in SQL*PLUS?
Ans  : Only P-CODE

Ques : Evaluate the following PL/SQL block:
DECLARE
v_low   NUMBER:=2;
v_upp   NUMBER:=100;
v_count NUMBER:=1;
BEGIN
FOR i IN v_low..v_low LOOP
INSERT INTO test(results)
VALUES (v_count)
v_count:=v_count+1;
END LOOP;
END;
How many times will the executable statements inside the FOR LOOP execute?
Ans  : 1

Ques : What can be done with the DBMS_LOB package?
Ans  : Use the DBMS_LOB.FILEEXISTS function to find the location of a BFILE

Ques : Examine the following code:
CREATE OR REPLACE TRIGGER UPD_SALARY
FOR EACH ROW
BEGIN
UPDATE TEAM
SET SALARY=SALARY+:NEW.SALARY
WHERE ID=:NEW.TEAM_ID
END;
Which statement must be added to make this trigger executable after updating the SALARY column of the PLAYER table?
Ans  : AFTER UPDATE ON PLAYER

Ques : Examine the following code:

CREATE OR REPLACE PACKAGE comm_package IS
g_comm NUMBER := 10;
PROCEDURE reset_comm(p_comm IN NUMBER);
END comm_package;

User MILLER executes the following code at 9:01am:
EXECUTE comm_package.g_comm := 15

User Smith executes the following code at 9:05am:
EXECUTE comm_package.g_comm := 20

Which of the following statement is true?
Ans  :  g_comm has a value of 15 at 9:06am for Miller

Ques : The CHECK_SAL procedure calls the UPD_SAL procedure. Both procedures are INVALID.Which command can be issued to recompile both procedures?
Ans  : ALTER PROCEDURE CHECK_SAL compile

Ques : Examine the following procedure:
PROCEDURE emp_salary
(v_bonus  BOOLEAN,
V_raise BOOLEAN,
V_issue_check in out BOOEAN)
is
BEGIN
v_issue_check:=v_bonus or v_raise;
END;
If v_bonus=TRUE and v_raise=NULL,which value is assigned to v_issue_check?
Ans  : TRUE

Ques : Which package construct must be declared and defined within the packages body?
Ans  :  Private Procedure

Ques : What happens when rows are found using a FETCH statement?
Ans  : The current row values are loaded into variables

Ques : Evaluate the following PL/SQL block:
DECLARE
result BOOLEAN;
BEGIN
DELETE FROM EMPloyee
WHERE dept_id IN (10,40,50);
result:=SQL%ISOPEN;
COMMIT:
END;

What will be the value of RESULT if three rows are deleted?
Ans  : FALSE

Ques : Which two statements among the following, regarding oracle database 10g PL/SQL support for LOB migration, are true?
Ans  : Standard package functions accept LOBs as parameters

Ques : Which command is used to disable all triggers on the EMPLOYEES table?
Ans  : ALTER TABLE employees DISABLE ALL TRIGGERS;

Ques : SQL%ISOPEN always evaluates to false in case of a/an:
Ans  : Implicit Cursor

Ques : Which datatype does the cursor attribute '%ISOPEN' return?
Ans  : BOOLEAN

Ques : Which of the following is a benefit of using procedures and functions?
Ans  : Procedures and Function avoid reparsing for multiple users by exploiting shared SQL areas

Ques : All packages can be recompiled by using an Oracle utility called:
Ans  :  Dbms_utility

Ques : Which type of variable should be used to assign the value TRUE, FALSE?
Ans  : Scalar

Ques : Examine the following code:
CREATE OR REPLACE TRIGGER update_emp
AFTER UPDATE ON emp
BEGIN
INSERT INTO audit_table (who, dated) VALUES (USER, SYSDATE);
END;
/
An UPDATE command is issued in the EMP table that results in changing 10 rows
How many rows are inserted into the AUDIT_TABLE ?
Ans  : 1

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