Explain ACID properties in a database transaction.
This question verifies the candidate's understanding of transaction reliability and consistency guarantees in DBMS.
Why Interviewers Ask This
ACID properties are fundamental to ensuring data correctness in financial and e-commerce transactions. Interviewers want to see if you can articulate how databases maintain consistency even during failures or concurrent access, which is vital for trust in the platform.
How to Answer This Question
List the four properties: Atomicity, Consistency, Isolation, Durability. Define each clearly with a brief example relevant to e-commerce, like an order placement. Explain how the database engine enforces these properties internally. Mention isolation levels briefly if needed to show depth.
Key Points to Cover
- Atomicity definition
- Consistency rules
- Isolation levels
- Durability guarantee
Sample Answer
ACID stands for Atomicity, Consistency, Isolation, and Durability. Atomicity ensures a transaction is all-or-nothing; either all steps succeed or none do. Consistency guarantees that a transaction brings the database fro…
Common Mistakes to Avoid
- Mixing up definitions
- Forgetting durability
- Lacking real-world examples
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