Redis vs Memcached

Frequently Asked Questions

What is the difference between Redis and Memcached?

Redis is the clear winner with its rich data structures, persistence, and versatility far beyond simple caching. Memcached remains a solid simple cache but cannot compete with Redis as a data platform. Choose Redis for nearly every use case.

Which is better, Redis or Memcached?

Redis is the recommended choice. Redis is the clear winner with its rich data structures, persistence, and versatility far beyond simple caching. Memcached remains a solid simple cache but cannot compete with Redis as a data platform. Choose Redis for nearly every use case.

What are the pros of Redis?

Rich data structures beyond key-value pairs. Built-in persistence and replication. Pub/sub messaging and streams. Lua scripting for server-side logic. Cluster mode for horizontal scaling.

What are the pros of Memcached?

Multi-threaded for better CPU utilization. Simpler architecture is easier to operate. Lower memory overhead per key. Predictable performance characteristics.

What are the cons of Redis?

Single-threaded core limits CPU utilization. Memory usage is higher than Memcached. License change to SSPL concerned some users.

What are the cons of Memcached?

Only supports simple key-value strings. No built-in persistence or replication. No pub/sub or advanced data structures. Feature development has largely stalled.

Why choose Redis over the alternative?

Redis is the recommended choice based on head-to-head comparison. Redis is the clear winner with its rich data structures, persistence, and versatility far beyond simple caching. Memcached remains a solid simple cache but cannot compete with Redis as a data platform. Choose Redis for nearly every use case.