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Architecture Matrix
Redis vs Memcached: In-Memory Data Store Comparison
Compare Redis (advanced in-memory data structures and persistence) with Memcached (pure multi-threaded high-concurrency key-value store).
Feature & Performance Breakdown
| Feature / Metric | Redis | Memcached | Advantage |
|---|---|---|---|
| Data Structures | Rich: Hashes, Lists, Sets, Sorted Sets, Bitmaps | Simple string key-value pairs only | Redis |
| Disk Persistence | Configurable RDB snapshots and AOF logs | Pure RAM only (no disk persistence) | Redis |
| Multi-threading Architecture | Single-threaded event loop (multi-threaded I/O) | Fully multi-threaded multi-core architecture | Memcached |
| Pub/Sub & Streaming | Built-in Pub/Sub and Redis Streams | None (caching only) | Redis |
When to Choose Redis:
- •Leaderboards (Sorted Sets), rate limiters, session stores, and message queues
- •Applications requiring persistent in-memory data across restarts
- •Geospatial queries and pub/sub message brokers
When to Choose Memcached:
- •Simple high-throughput caching of static HTML/DB query fragments
- •Multi-core servers with massive concurrent read/write scaling
- •Ultra-low overhead raw key-value caching where simplicity is key