Database Programming with SQL-Section 18 Quiz

Test: Section 18 Quiz
Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 18 Quiz
(Answer all questions in this section)

1. Steven King's row in the EMPLOYEES table has EMPLOYEE_ID = 100 and SALARY = 24000. A user issues the following statements in the order shown:
UPDATE employees
SET salary = salary * 2
WHERE employee_id = 100;
COMMIT;

UPDATE employees
SET salary = 30000
WHERE employee_id = 100;

The user's database session now ends abnormally. What is now King's salary in the table?

 Mark for Review
(1) Points


24000


48000 (*)


30000


78000



Incorrect Incorrect. Refer to Section 18 Lesson 1.


2. If UserB has privileges to see the data in a table, as soon as UserA has entered data into that table, UserB can see that data. True or False? Mark for Review
(1) Points


True


False (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


3. Examine the following statements:
INSERT INTO emps SELECT * FROM employees; -- 107 rows inserted.
SAVEPOINT Ins_Done;
DELETE employees; -- 107 rows deleted
SAVEPOINT Del_Done;
UPDATE emps SET last_name = 'Smith';

How would you undo the last Update only?

 Mark for Review
(1) Points


ROLLBACK UPDATE;


There is nothing you can do.


COMMIT Del_Done;


ROLLBACK to SAVEPOINT Del_Done; (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


4. You need not worry about controlling your transactions. Oracle does it all for you. True or False? Mark for Review
(1) Points


True


False (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


5. When you logout of Oracle, your data changes are automatically rolled back. True or False? Mark for Review
(1) Points


True


False (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


Page 1 of 3 Next Summary


Test: Section 18 Quiz
Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 18 Quiz
(Answer all questions in this section)

6. Which SQL statement is used to remove all the changes made by an uncommitted transaction? Mark for Review
(1) Points


UNDO;


ROLLBACK TO SAVEPOINT;


REVOKE;


ROLLBACK; (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


7. COMMIT saves all outstanding data changes? True or False? Mark for Review
(1) Points


True (*)


False



Correct Correct


8. If a database crashes, all uncommitted changes are automatically rolled back. True or False? Mark for Review
(1) Points


True (*)


False



Correct Correct


9. If Oracle crashes, your changes are automatically rolled back. True or False? Mark for Review
(1) Points


True (*)


False



Correct Correct


10. User BOB's CUSTOMERS table contains 20 rows. BOB inserts two more rows into the table but does not COMMIT his changes. User JANE now executes:
SELECT COUNT(*) FROM bob.customers;

What result will JANE see?

 Mark for Review
(1) Points


22


2


JANE will receive an error message because she is not allowed to query the table while BOB is updating it.


20 (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


Previous Page 2 of 3 Next Summary


Test: Section 18 Quiz
Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 18 Quiz
(Answer all questions in this section)

11. Examine the following statements:
INSERT INTO emps SELECT * FROM employees; -- 107 rows inserted.
SAVEPOINT Ins_Done;
CREATE INDEX emp_lname_idx ON employees(last_name);
UPDATE emps SET last_name = 'Smith';

What happens if you issue a Rollback statement?

 Mark for Review
(1) Points


The update of last_name is undone, but the insert was committed by the CREATE INDEX statement. (*)


Both the UPDATE and the INSERT will be rolled back.


The INSERT is undone but the UPDATE is committed.


Nothing happens.



Incorrect Incorrect. Refer to Section 18 Lesson 1.


12. Examine the following statements:
UPDATE employees SET salary = 15000;
SAVEPOINT upd1_done;
UPDATE employees SET salary = 22000;
SAVEPOINT upd2_done;
DELETE FROM employees;

You want to retain all the employees with a salary of 15000; What statement would you execute next?

 Mark for Review
(1) Points


ROLLBACK;


ROLLBACK TO SAVEPOINT upd1_done; (*)


ROLLBACK TO SAVEPOINT upd2_done;


ROLLBACK TO SAVE upd1_done;


There is nothing you can do; either all changes must be rolled back, or none of them can be rolled back.



Incorrect Incorrect. Refer to Section 18 Lesson 1.


13. Table MYTAB contains only one column of datatype CHAR(1). A user executes the following statements in the order shown.
INSERT INTO mytab VALUES ('A');
INSERT INTO mytab VALUES ('B');
COMMIT;
INSERT INTO mytab VALUES ('C');
ROLLBACK;

Which rows does the table now contain?

 Mark for Review
(1) Points


A, B, and C


A and B (*)


C


None of the above



Incorrect Incorrect. Refer to Section 18 Lesson 1.


14. A transaction makes several successive changes to a table. If required, you want to be able to rollback the later changes while keeping the earlier changes. What must you include in your code to do this? Mark for Review
(1) Points


A database link


An object privilege


A savepoint (*)


A sequence


An update statement



Incorrect Incorrect. Refer to Section 18 Lesson 1.


15. Which of the following best describes the term "read consistency"? Mark for Review
(1) Points


It prevents users from querying tables on which they have not been granted SELECT privilege


It prevents other users from seeing changes to a table until those changes have been committed (*)


It prevents other users from querying a table while updates are being executed on it


It ensures that all changes to a table are automatically committed



Incorrect Incorrect. Refer to Section 18 Lesson 1.


Previous Page 3 of 3 Summary


Test: Section 18 Quiz
Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 18 Quiz
(Answer all questions in this section)

1. Steven King's row in the EMPLOYEES table has EMPLOYEE_ID = 100 and SALARY = 24000. A user issues the following statements in the order shown:
UPDATE employees
SET salary = salary * 2
WHERE employee_id = 100;
COMMIT;

UPDATE employees
SET salary = 30000
WHERE employee_id = 100;

The user's database session now ends abnormally. What is now King's salary in the table?

 Mark for Review
(1) Points


30000


24000


78000


48000 (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


2. A transaction makes several successive changes to a table. If required, you want to be able to rollback the later changes while keeping the earlier changes. What must you include in your code to do this? Mark for Review
(1) Points


A sequence


A database link


An object privilege


An update statement


A savepoint (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


3. Table MYTAB contains only one column of datatype CHAR(1). A user executes the following statements in the order shown.
INSERT INTO mytab VALUES ('A');
INSERT INTO mytab VALUES ('B');
COMMIT;
INSERT INTO mytab VALUES ('C');
ROLLBACK;

Which rows does the table now contain?

 Mark for Review
(1) Points


A, B, and C


A and B (*)


C


None of the above



Incorrect Incorrect. Refer to Section 18 Lesson 1.


4. Which SQL statement is used to remove all the changes made by an uncommitted transaction? Mark for Review
(1) Points


UNDO;


ROLLBACK TO SAVEPOINT;


ROLLBACK; (*)


REVOKE;



Incorrect Incorrect. Refer to Section 18 Lesson 1.


5. User BOB's CUSTOMERS table contains 20 rows. BOB inserts two more rows into the table but does not COMMIT his changes. User JANE now executes:
SELECT COUNT(*) FROM bob.customers;

What result will JANE see?

 Mark for Review
(1) Points


2


22


JANE will receive an error message because she is not allowed to query the table while BOB is updating it.


20 (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


Page 1 of 3 Next Summary


Test: Section 18 Quiz
Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 18 Quiz
(Answer all questions in this section)

6. Examine the following statements:
INSERT INTO emps SELECT * FROM employees; -- 107 rows inserted.
SAVEPOINT Ins_Done;
CREATE INDEX emp_lname_idx ON employees(last_name);
UPDATE emps SET last_name = 'Smith';

What happens if you issue a Rollback statement?

 Mark for Review
(1) Points


The update of last_name is undone, but the insert was committed by the CREATE INDEX statement. (*)


Both the UPDATE and the INSERT will be rolled back.


The INSERT is undone but the UPDATE is committed.


Nothing happens.



Correct Correct


7. COMMIT saves all outstanding data changes? True or False? Mark for Review
(1) Points


True (*)


False



Correct Correct


8. Examine the following statements:
UPDATE employees SET salary = 15000;
SAVEPOINT upd1_done;
UPDATE employees SET salary = 22000;
SAVEPOINT upd2_done;
DELETE FROM employees;

You want to retain all the employees with a salary of 15000; What statement would you execute next?

 Mark for Review
(1) Points


ROLLBACK;


ROLLBACK TO SAVEPOINT upd1_done; (*)


ROLLBACK TO SAVEPOINT upd2_done;


ROLLBACK TO SAVE upd1_done;


There is nothing you can do; either all changes must be rolled back, or none of them can be rolled back.



Correct Correct


9. If a database crashes, all uncommitted changes are automatically rolled back. True or False? Mark for Review
(1) Points


True (*)


False



Correct Correct


10. Examine the following statements:
INSERT INTO emps SELECT * FROM employees; -- 107 rows inserted.
SAVEPOINT Ins_Done;
DELETE employees; -- 107 rows deleted
SAVEPOINT Del_Done;
UPDATE emps SET last_name = 'Smith';

How would you undo the last Update only?

 Mark for Review
(1) Points


ROLLBACK UPDATE;


ROLLBACK to SAVEPOINT Del_Done; (*)


COMMIT Del_Done;


There is nothing you can do.



Correct Correct


Previous Page 2 of 3 Next Summary


Test: Section 18 Quiz
Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 18 Quiz
(Answer all questions in this section)

11. Which of the following best describes the term "read consistency"? Mark for Review
(1) Points


It ensures that all changes to a table are automatically committed


It prevents users from querying tables on which they have not been granted SELECT privilege


It prevents other users from seeing changes to a table until those changes have been committed (*)


It prevents other users from querying a table while updates are being executed on it



Incorrect Incorrect. Refer to Section 18 Lesson 1.


12. If Oracle crashes, your changes are automatically rolled back. True or False? Mark for Review
(1) Points


True (*)


False



Correct Correct


13. If UserB has privileges to see the data in a table, as soon as UserA has entered data into that table, UserB can see that data. True or False? Mark for Review
(1) Points


True


False (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


14. When you logout of Oracle, your data changes are automatically rolled back. True or False? Mark for Review
(1) Points


True


False (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


15. You need not worry about controlling your transactions. Oracle does it all for you. True or False? Mark for Review
(1) Points


True


False (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


Previous Page 3 of 3 Summary


Test: Section 18 Quiz
Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 18 Quiz
(Answer all questions in this section)

1. Which of the following best describes the term "read consistency"? Mark for Review
(1) Points


It ensures that all changes to a table are automatically committed


It prevents other users from seeing changes to a table until those changes have been committed (*)


It prevents other users from querying a table while updates are being executed on it


It prevents users from querying tables on which they have not been granted SELECT privilege



Correct Correct


2. User BOB's CUSTOMERS table contains 20 rows. BOB inserts two more rows into the table but does not COMMIT his changes. User JANE now executes:
SELECT COUNT(*) FROM bob.customers;

What result will JANE see?

 Mark for Review
(1) Points


20 (*)


JANE will receive an error message because she is not allowed to query the table while BOB is updating it.


22


2



Incorrect Incorrect. Refer to Section 18 Lesson 1.


3. When you logout of Oracle, your data changes are automatically rolled back. True or False? Mark for Review
(1) Points


True


False (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


4. If Oracle crashes, your changes are automatically rolled back. True or False? Mark for Review
(1) Points


True (*)


False



Correct Correct


5. If a database crashes, all uncommitted changes are automatically rolled back. True or False? Mark for Review
(1) Points


True (*)


False



Correct Correct


Page 1 of 3 Next Summary


Test: Section 18 Quiz
Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 18 Quiz
(Answer all questions in this section)

6. Examine the following statements:
UPDATE employees SET salary = 15000;
SAVEPOINT upd1_done;
UPDATE employees SET salary = 22000;
SAVEPOINT upd2_done;
DELETE FROM employees;

You want to retain all the employees with a salary of 15000; What statement would you execute next?

 Mark for Review
(1) Points


ROLLBACK;


ROLLBACK TO SAVEPOINT upd1_done; (*)


ROLLBACK TO SAVEPOINT upd2_done;


ROLLBACK TO SAVE upd1_done;


There is nothing you can do; either all changes must be rolled back, or none of them can be rolled back.



Incorrect Incorrect. Refer to Section 18 Lesson 1.


7. Table MYTAB contains only one column of datatype CHAR(1). A user executes the following statements in the order shown.
INSERT INTO mytab VALUES ('A');
INSERT INTO mytab VALUES ('B');
COMMIT;
INSERT INTO mytab VALUES ('C');
ROLLBACK;

Which rows does the table now contain?

 Mark for Review
(1) Points


A, B, and C


A and B (*)


C


None of the above



Incorrect Incorrect. Refer to Section 18 Lesson 1.


8. Which SQL statement is used to remove all the changes made by an uncommitted transaction? Mark for Review
(1) Points


ROLLBACK TO SAVEPOINT;


ROLLBACK; (*)


REVOKE;


UNDO;



Incorrect Incorrect. Refer to Section 18 Lesson 1.


9. Examine the following statements:
INSERT INTO emps SELECT * FROM employees; -- 107 rows inserted.
SAVEPOINT Ins_Done;
DELETE employees; -- 107 rows deleted
SAVEPOINT Del_Done;
UPDATE emps SET last_name = 'Smith';

How would you undo the last Update only?

 Mark for Review
(1) Points


ROLLBACK UPDATE;


There is nothing you can do.


COMMIT Del_Done;


ROLLBACK to SAVEPOINT Del_Done; (*)



Correct Correct


10. Steven King's row in the EMPLOYEES table has EMPLOYEE_ID = 100 and SALARY = 24000. A user issues the following statements in the order shown:
UPDATE employees
SET salary = salary * 2
WHERE employee_id = 100;
COMMIT;

UPDATE employees
SET salary = 30000
WHERE employee_id = 100;

The user's database session now ends abnormally. What is now King's salary in the table?

 Mark for Review
(1) Points


48000 (*)


30000


24000


78000



Incorrect Incorrect. Refer to Section 18 Lesson 1.


Previous Page 2 of 3 Next Summary


Test: Section 18 Quiz
Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 18 Quiz
(Answer all questions in this section)

11. Examine the following statements:
INSERT INTO emps SELECT * FROM employees; -- 107 rows inserted.
SAVEPOINT Ins_Done;
CREATE INDEX emp_lname_idx ON employees(last_name);
UPDATE emps SET last_name = 'Smith';

What happens if you issue a Rollback statement?

 Mark for Review
(1) Points


The update of last_name is undone, but the insert was committed by the CREATE INDEX statement. (*)


Both the UPDATE and the INSERT will be rolled back.


The INSERT is undone but the UPDATE is committed.


Nothing happens.



Correct Correct


12. If UserB has privileges to see the data in a table, as soon as UserA has entered data into that table, UserB can see that data. True or False? Mark for Review
(1) Points


True


False (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


13. A transaction makes several successive changes to a table. If required, you want to be able to rollback the later changes while keeping the earlier changes. What must you include in your code to do this? Mark for Review
(1) Points


An update statement


A savepoint (*)


A sequence


A database link


An object privilege



Incorrect Incorrect. Refer to Section 18 Lesson 1.


14. COMMIT saves all outstanding data changes? True or False? Mark for Review
(1) Points


True (*)


False



Correct Correct


15. You need not worry about controlling your transactions. Oracle does it all for you. True or False? Mark for Review
(1) Points


True


False (*)



Incorrect Incorrect. Refer to Section 18 Lesson 1.


Previous Page 3 of 3 Summary