What is Redis data eviction and how does it work?

What is Redis data eviction and how does it work?

Redis data eviction is the process of removing keys from memory when the maximum memory limit is reached. It helps manage memory efficiently.

What are the different eviction policies available in Redis?

Redis offers several eviction policies, including LRU (Least Recently Used), LFU (Least Frequently Used), and volatile-lru, among others.

How do I configure the eviction policy in my Redis instance?

You can configure the eviction policy in the Redis configuration file using the 'maxmemory-policy' directive or via the CONFIG SET command.

Can I prevent certain keys from being evicted?

Yes, you can use the 'volatile' prefix for keys to ensure they are only evicted when the max memory limit is reached.

What happens to the data when it gets evicted?

When data is evicted, it is permanently removed from memory, and you cannot retrieve it unless you have a backup.