Transaction Control Language (TCL) MCQs in DBMS

By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 23, 2024

MCQs on Transaction Control Language (TCL) in DBMS

1. Which of the following is not a TCL command?
   • a) COMMIT
   • b) SAVEPOINT
   • c) ROLLBACK
   • d) SELECT

   Answer: d) SELECT

2. What does the COMMIT command do in a transaction?
   • a) It ends the current transaction and makes all changes made by the transaction permanent.
   • b) It saves the current state of the transaction.
   • c) It undoes all the changes made in the current transaction.
   • d) It starts a new transaction.

   Answer: a) It ends the current transaction and makes all changes made by the transaction permanent.

3. Which command is used to undo all the changes made in the current transaction?
   • a) COMMIT
   • b) SAVEPOINT
   • c) ROLLBACK
   • d) GRANT

   Answer: c) ROLLBACK

4. What is the purpose of the SAVEPOINT command?
   • a) To end a transaction and make all changes permanent.
   • b) To save the current state of a transaction so that changes can be rolled back to that point if needed.
   • c) To undo all changes made in the current transaction.
   • d) To start a new transaction.

   Answer: b) To save the current state of a transaction so that changes can be rolled back to that point if needed.

5. Which command is used to roll back a transaction to a specific savepoint?
   • a) COMMIT
   • b) SAVEPOINT
   • c) ROLLBACK TO SAVEPOINT
   • d) GRANT

   Answer: c) ROLLBACK TO SAVEPOINT

6. If a transaction has several savepoints and you issue a ROLLBACK TO SAVEPOINT command, what happens to the changes made after the savepoint?
   • a) They are committed.
   • b) They are undone.
   • c) They remain unchanged.
   • d) None of the above.

   Answer: b) They are undone.

7. In which scenario would you use the ROLLBACK command?
   • a) When you want to make the changes made by the transaction permanent.
   • b) When you want to undo changes made in a transaction due to an error or user decision.
   • c) When you want to create a new savepoint.
   • d) When you want to grant privileges to a user.

   Answer: b) When you want to undo changes made in a transaction due to an error or user decision.

8. What happens if you issue a COMMIT command within a transaction that has savepoints?
   • a) Only changes after the last savepoint are committed.
   • b) All changes made by the transaction, including those before and after savepoints, are committed.
   • c) Changes are committed only up to the first savepoint.
   • d) The transaction is rolled back.

   Answer: b) All changes made by the transaction, including those before and after savepoints, are committed.

9. Which command is used to permanently save all the transactions in the database?
   • a) COMMIT
   • b) SAVEPOINT
   • c) ROLLBACK
   • d) REVOKE

   Answer: a) COMMIT

10. What is the primary purpose of Transaction Control Language (TCL) commands in DBMS?
    • a) To manage and control the execution of transactions to maintain data integrity.
    • b) To define the structure of the database.
    • c) To grant and revoke privileges to users.
    • d) To retrieve data from the database.

    Answer: a) To manage and control the execution of transactions to maintain data integrity.

 

More MCQs Of Database Systems

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