Transaction Control Language (TCL) MCQs in DBMS

By: Prof. Dr. Fazal Rehman | 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

1. Database Models MCQs in DBMS
   1. Hierarchical model MCQs in DBMS
   2. Network model MCQs in DBMS
   3. Relational model MCQs in DBMS
   4. Object-oriented model MCQs in DBMS
   5. NoSQL databases MCQs in DBMS
2. Relational Database Model MCQs in DBMS
   1. tables, attributes, tuples, and relations MCQs in DBMS
   2. Primary keys and foreign keys MCQs in DBMS
   3. Integrity constraints MCQs in DBMS
3. SQL (Structured Query Language) MCQs in DBMS
   1. Data Definition Language (DDL) MCQs in DBMS
   2. Data Manipulation Language (DML) MCQs in DBMS
   3. Data Control Language (DCL) MCQs in DBMS
   4. Transaction Control Language (TCL) MCQs in DBMS
   5. Advanced SQL queries and functions MCQs in DBMS
4. Database Design MCQs in DBMS
   1. Entity-Relationship (ER) modeling MCQs in DBMS
   2. Extended ER modeling MCQs in DBMS
   3. Normalization and normal forms (1NF, 2NF, 3NF, BCNF) MCQs in DBMS
   4. Denormalization MCQs in DBMS
5. Database Management System Architecture MCQs in DBMS
   1. Three-schema architecture (external, conceptual, internal) MCQs in DBMS
   2. Data independence MCQs in DBMS
   3. DBMS components and functions MCQs in DBMS
6. Storage and File Structure MCQs in DBMS
   1. Data storage on physical media MCQs in DBMS
   2. File organization and access methods MCQs
   3. Indexing (B-trees, hash indexing) MCQs in DBMS
   4. RAID technology MCQs in DBMS
7. Query Processing and Optimization MCQs in DBMS
8. Database Transaction Management MCQs in DBMS
   1. ACID properties (Atomicity, Consistency, Isolation, Durability) MCQs in DBMS
   2. Transaction states and lifecycle MCQs in DBMS
   3. Concurrency control techniques (locking, timestamping, multiversion) MCQs in DBMS
   4. Deadlock detection and resolution MCQs in DBMS
9. Database Security and Authorization MCQs in DBMS
   1. Authentication and authorization mechanisms MCQs in DBMS
   2. Data encryption techniques MCQs in DBMS
   3. Role-based access control MCQs in DBMS
   4. SQL injection prevention MCQs in DBMS
10. Backup and Recovery MCQs in DBMS
    1. Backup types and strategies MCQs in DBMS
    2. Recovery techniques (log-based, shadow paging) MCQs in DBMS
    3. Disaster recovery planning MCQs in DBMS
11. Distributed Databases MCQs in DBMS
    1. Distributed database architecture MCQs MCQs in DBMS
    2. Data fragmentation, replication, and allocation in DBMS
    3. Distributed query processing MCQs in DBMS
    4. Consistency models and protocols MCQs in DBMS

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