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

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1. Which ACID property ensures that a transaction is treated as a single unit of work, meaning it either fully completes or fully fails?



2. Which ACID property ensures that a database remains in a valid state before and after a transaction?



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?



4. Which ACID property ensures that once a transaction has been committed, it will remain committed even in the event of a system failure?



5. What does the Atomicity property ensure in the context of a transaction?



6. If a transaction causes an update to a database that cannot be rolled back, which ACID property is at risk?



7. Which ACID property would be violated if a transaction read data that was modified by another concurrent transaction but not yet committed?



8. Which mechanism is often used to implement the Isolation property in a database system?



9. What does the Durability property ensure about a transaction’s effects?



10. Which of the following scenarios demonstrates a failure to uphold the Consistency property?



11. In a DBMS, how can Durability be ensured?



12. Which ACID property is tested when verifying that a transaction does not interfere with other concurrently executing transactions?



13. What happens if the Atomicity property is not properly implemented during a transaction?



14. Which DBMS component helps in implementing the Consistency property?



15. Which type of failure primarily tests the Durability property of a database?



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