Caching
7 topics in caching.
Caching 101: Cache-Aside, TTL, Invalidation and Redis Basics
Learn caching fundamentals for system design: cache-aside, TTLs, invalidation, Redis, hit rate, stampedes, consistency, and interview examples.
Caching Strategies
Choosing the wrong caching strategy leads to stale data, cache misses, or unnecessary database load.
Cache Eviction Policies: LRU, LFU, FIFO and TTL Tradeoffs
Compare cache eviction policies including LRU, LFU, FIFO, random eviction and TTL-based expiry with hit-rate, memory, and Redis interview tradeoffs.
Distributed Caching
A single Redis server can only hold as much data as its RAM allows. Distributed caching (Redis Cluster, Memcached with consistent hashing) scales.
Content Delivery Network (CDN)
CDNs are essential for any user-facing application. They reduce latency, reduce origin server load, protect against DDoS attacks, and handle traffic.
Cache Warming: Prevent Cold Starts and Latency Spikes
Learn cache warming strategies for production systems: preloading hot keys, deployment warming, CDN warming, invalidation risks, and interview tradeoffs.
Cache Stampede
A cache stampede (thundering herd) occurs when many requests simultaneously miss the cache and hit the database, causing a load spike that can bring down.