What are some examples of Redis eviction policies?

What are some examples of Redis eviction policies?

Redis has several eviction policies to manage memory when it reaches its limit. Some examples include LRU (Least Recently Used), LFU (Least Frequently Used), and TTL (Time to Live). Would you like to know more about how each one works?

Yes, can you explain how LRU works?

Sure! LRU stands for Least Recently Used. It evicts the least recently accessed keys first when the memory limit is reached. This is useful for keeping frequently accessed data in memory.

What about LFU?

LFU, or Least Frequently Used, evicts the keys that are used the least often. It tracks the frequency of access for each key and removes the ones that have been accessed the least over time.

Can you give me a scenario where TTL would be useful?

Absolutely! TTL is useful for caching data that is only relevant for a short period, like session tokens or temporary data. Once the TTL expires, the key is automatically removed from memory.