What are the ACID properties of a database transaction?
This question tests your knowledge of transaction guarantees ensuring reliable processing. It is critical for any role involving financial or critical data operations.
Why Interviewers Ask This
ACID properties define the reliability of database transactions. Interviewers want to confirm you understand how databases maintain consistency during failures. This is fundamental for building trustworthy applications.
How to Answer This Question
List the four properties: Atomicity, Consistency, Isolation, Durability. Define each clearly with a brief example. Explain how databases enforce these rules. Mention isolation levels briefly. Connect to real-world scenarios like banking transfers.
Key Points to Cover
- Atomicity definition
- Consistency constraints
- Isolation levels
- Durability mechanisms
Sample Answer
ACID stands for Atomicity, Consistency, Isolation, and Durability. Atomicity ensures all parts of a transaction succeed or none do. Consistency guarantees the database remains in a valid state before and after. Isolation…
Common Mistakes to Avoid
- Defining properties incorrectly
- Confusing isolation with atomicity
- No real-world examples
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