Caching Design Pattern
Overview
Caching is a design pattern that stores frequently accessed data in a faster storage layer to improve performance and reduce latency.
Key Concepts
- Cache Hit: Data found in cache
- Cache Miss: Data not found in cache
- Cache Invalidation: Removing or updating stale data
Common Cache Strategies
- Cache-Aside: Application manages cache explicitly
- Write-Through: Write to cache and database simultaneously
- Write-Behind: Write to cache first, database later
- Read-Through: Cache loads data on miss
Benefits
- Reduced latency
- Lower database load
- Better scalability
Challenges
- Cache invalidation complexity
- Memory constraints
- Consistency issues