What are Redis eviction policies?

What are Redis eviction policies?

Redis eviction policies determine how Redis handles data when it reaches its memory limit. They decide which keys to remove to make space for new data.

Can you explain the different types of eviction policies?

Sure! Redis has several eviction policies: LRU (Least Recently Used), LFU (Least Frequently Used), and volatile-lru, among others. Each has its own strategy for key removal.

What is the difference between LRU and LFU?

LRU removes the least recently used keys, while LFU removes the least frequently accessed keys. LRU focuses on recency, whereas LFU focuses on access frequency.

When should I use each policy?

Use LRU when you want to prioritize recent data, and LFU when you want to keep frequently accessed data, even if it's older.