This repository demonstrates Database Locking mechanisms using Optimistic Locking and Pessimistic Locking implemented with Spring Boot and JPA.
🧠 Database locking ensures data consistency and prevents concurrent update conflicts when multiple users or transactions try to modify the same data simultaneously.
Database locking is a mechanism used to control concurrent access to shared data. It ensures that multiple transactions do not corrupt data integrity while reading or writing records.
✔ Prevents lost updates ✔ Maintains consistency ✔ Supports concurrent transactions safely
Optimistic locking assumes conflicts are rare and does not lock records during read operations.
- Uses a version field (e.g.
@Version) - Data is updated only if the version matches
- If version changes → update fails
✔ High performance ✔ No database-level locks ✔ Best for read-heavy systems
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Pessimistic locking assumes conflicts are frequent and locks data immediately when accessed.
- Locks the row during read/write
- Other transactions must wait
- Lock released after transaction completes
✔ Strong data consistency ✔ Prevents concurrent modifications ✔ Suitable for critical updates
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| Technology | Usage |
|---|---|
| ☕ Java | Core language |
| 🌱 Spring Boot | Backend framework |
| 🧩 Spring Data JPA | ORM & persistence |
| 🐘 Hibernate | Locking implementation |
git clone https://github.com/your-username/database-locking.git
cd database-locking./mvnw spring-boot:run- Banking & financial systems
- Inventory management
- Booking systems
- Concurrent transaction handling
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