Java Interview Questions
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Transaction interview questions and answers.

Transaction questions show up in Java backend interviews whenever data consistency, concurrency, and service boundaries matter. This page groups the transaction concepts that usually separate surface-level Spring knowledge from real production understanding.

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What interviewers usually test here

Strong transaction answers combine database fundamentals with application behavior. Interviewers often want to hear not only what ACID means, but also how isolation levels affect anomalies, why long transactions are dangerous, and where transactional boundaries should start and end in service-oriented code. In Java roles, these questions often blend SQL behavior with Spring @Transactional behavior.

If you can clearly explain rollback rules, propagation, locking, MVCC, and what happens when multiple requests update the same data, you usually sound much more experienced than candidates who only repeat textbook definitions.

Representative transaction interview questions

  1. What is a transaction?
  2. What do the ACID properties mean?
  3. What isolation levels exist and why do they matter?
  4. What anomalies can happen with weak isolation?
  5. How does @Transactional work in Spring?
  6. What is transaction propagation?
  7. When does Spring roll back a transaction?
  8. What is the difference between optimistic and pessimistic locking?
  9. How does MVCC relate to transactions in PostgreSQL?
  10. Why are long-running transactions a problem?

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