ACID properties (Atomicity, Consistency, Isolation, Durability) MCQs in DBMS

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

1. Which ACID property ensures that a transaction is treated as a single unit of work, meaning it either fully completes or fully fails?
   a) Atomicity
   b) Consistency
   c) Isolation
   d) DurabilityAnswer: a) Atomicity
2. Which ACID property ensures that a database remains in a valid state before and after a transaction?
   a) Atomicity
   b) Consistency
   c) Isolation
   d) DurabilityAnswer: b) Consistency
3. Which ACID property guarantees that concurrent execution of transactions will result in a system state that would be obtained if transactions were executed serially?
   a) Atomicity
   b) Consistency
   c) Isolation
   d) DurabilityAnswer: c) Isolation
4. Which ACID property ensures that once a transaction has been committed, it will remain committed even in the event of a system failure?
   a) Atomicity
   b) Consistency
   c) Isolation
   d) DurabilityAnswer: d) Durability
5. What does the Atomicity property ensure in the context of a transaction?
   a) Transactions are executed in a way that maintains database consistency.
   b) All operations of a transaction are completed, or none are executed.
   c) Transactions do not interfere with each other’s execution.
   d) Changes made by a transaction are permanent even after a failure.Answer: b) All operations of a transaction are completed, or none are executed.
6. If a transaction causes an update to a database that cannot be rolled back, which ACID property is at risk?
   a) Atomicity
   b) Consistency
   c) Isolation
   d) DurabilityAnswer: a) Atomicity
7. Which ACID property would be violated if a transaction read data that was modified by another concurrent transaction but not yet committed?
   a) Atomicity
   b) Consistency
   c) Isolation
   d) DurabilityAnswer: c) Isolation
8. Which mechanism is often used to implement the Isolation property in a database system?
   a) Checkpoints
   b) Two-phase commit protocol
   c) Locking and concurrency control
   d) Redundant arrays of independent disks (RAID)Answer: c) Locking and concurrency control
9. What does the Durability property ensure about a transaction’s effects?
   a) They are temporary until confirmed by the user.
   b) They are rolled back if a failure occurs.
   c) They are preserved and not lost due to system failures.
   d) They are subject to being overridden by other transactions.Answer: c) They are preserved and not lost due to system failures.
10. Which of the following scenarios demonstrates a failure to uphold the Consistency property?
    a) A transaction that successfully commits after ensuring no conflicting updates
    b) A transaction that fails to complete, but all its operations are rolled back
    c) A transaction that leaves the database in a state where constraints are violated
    d) A transaction that ensures its changes are visible to all subsequent transactionsAnswer: c) A transaction that leaves the database in a state where constraints are violated
11. In a DBMS, how can Durability be ensured?
    a) By using rollback segments
    b) By maintaining transaction logs and ensuring that changes are written to non-volatile storage
    c) By using isolation levels to control visibility of transaction changes
    d) By employing deadlock detection mechanismsAnswer: b) By maintaining transaction logs and ensuring that changes are written to non-volatile storage
12. Which ACID property is tested when verifying that a transaction does not interfere with other concurrently executing transactions?
    a) Atomicity
    b) Consistency
    c) Isolation
    d) DurabilityAnswer: c) Isolation
13. What happens if the Atomicity property is not properly implemented during a transaction?
    a) The database may remain in an inconsistent state.
    b) Data loss may occur in the event of a system failure.
    c) Concurrent transactions may affect each other.
    d) Transactions may not be logged correctly.Answer: a) The database may remain in an inconsistent state.
14. Which DBMS component helps in implementing the Consistency property?
    a) Recovery manager
    b) Concurrency control manager
    c) Transaction manager
    d) Log managerAnswer: b) Concurrency control manager
15. Which type of failure primarily tests the Durability property of a database?
    a) System crash
    b) Application bug
    c) Data entry error
    d) Network failureAnswer: a) System crash

 

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