midDatabases
Explain Database Transactions and Isolation Levels.
Updated Apr 28, 2026
Short answer
Isolation levels define how transaction integrity is visible to other users and systems.
Deep explanation
Exploring concurrency control. How MVCC (Multi-Version Concurrency Control) works to allow readers and writers to operate without blocking each other.
Real-world example
Banking systems using SERIALIZABLE isolation to prevent double-spending.
Common mistakes
- Over-indexing tables which slows down INSERT/UPDATE operations.
Follow-up questions
- What is Dirty Read?