🚀 Database Caching In Spring Boot?

Database Caching stores frequently accessed data in memory (RAM), so your app doesn’t hit the database every time.

🎯 Result: Faster performance + reduced DB load

✅ When to Use It?

  • Same data is read again and again (e.g., user info, product list)
  • Performance is critical (e.g., high-traffic APIs)

🛠️ How to Enable Caching in Spring Boot

✅ Step 1: Add Starter Dependency

In pom.xml:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-cache</artifactId>
</dependency>

✅ Step 2: Enable Caching in Main Class

@SpringBootApplication
@EnableCaching
public class MyApp {
    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }
}

✅ Step 3: Use @Cacheable in Your Service

 

@Service
public class StudentService {

    @Autowired
    private StudentRepository repo;

    @Cacheable("students")
    public Student getStudentById(Long id) {
        System.out.println("Fetching from DB...");
        return repo.findById(id).orElse(null);
    }
}

📌 Now, the first call will fetch from the DB and store it in cache.
Next time? Fetched from memory – faster!

⚙️ How It Works

  • @Cacheable → stores method result
  • @CacheEvict → removes entry from cache
  • @CachePut → updates entry in cache

🧠 What Cache is Used?

By default: Simple in-memory (ConcurrentMap)

For production: Use EhCache, Redis, or Caffeine

🗂 application.properties (optional settings)

spring.cache.type=simple   # or redis, caffeine, etc.

🧪 Example Output:

GET /students/101
→ Fetching from DB...

GET /students/101 (again)
→ (No DB call – data returned from cache)

 

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