What are the different eviction policies in Redis and how do I implement them?

What are the different eviction policies in Redis?

Redis supports several eviction policies, including LRU (Least Recently Used), LFU (Least Frequently Used), and volatile-lru. Each policy determines how Redis manages memory when it reaches its limit.

How do I implement the LRU eviction policy?

To implement the LRU eviction policy, you can set the maxmemory policy in your Redis configuration file or use the command: CONFIG SET maxmemory-policy allkeys-lru.

Can I see an example of how to configure this in the Redis config file?

Sure! In your redis.conf file, you would add: maxmemory 256mb and maxmemory-policy allkeys-lru to set the memory limit and eviction policy.

What happens if I don't set an eviction policy?

If you don't set an eviction policy, Redis will return an error when it reaches its memory limit, and it won't be able to accept new writes.