Explain ACID properties of a database transaction
This DBMS question covers the four pillars ensuring reliable processing of database transactions. It is fundamental for financial and e-commerce systems.
Why Interviewers Ask This
ACID compliance guarantees data reliability even during failures. Interviewers want to verify you understand atomicity, consistency, isolation, and durability. This is critical for handling payments and inventory updates.
How to Answer This Question
List and define each property: Atomicity, Consistency, Isolation, Durability. Provide a brief example for each, such as a bank transfer. Explain how databases enforce these properties internally.
Key Points to Cover
- Atomicity definition
- Consistency rules
- Isolation levels
- Durability guarantees
Sample Answer
ACID stands for Atomicity, Consistency, Isolation, and Durability. Atomicity ensures all steps succeed or none do. Consistency maintains valid database states. Isolation prevents interference between concurrent transacti…
Common Mistakes to Avoid
- Mixing up isolation levels
- Failing to define each term
- No practical examples
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