Redis data clearing

There are two methods to clear redis data:

1. Manual clearing: Specifies the key to be cleared. You can clear the key by using the DELETE command.
2. Automatic cleanup: use the data expiration Policy provided by redis

Redis data expiration Policy

• Noeviction: an error is returned when the memory limit is reached.
• Allkeys-LRU: removes all keys using the LRU algorithm.
• Volatile-LRU: only the key with an expiration time is removed using the LRU algorithm.
• Allkeys-random: removes all keys randomly.
• Volatile-random: removes random keys with an expiration time.
• Volatile-TTL: only remove the key with a small expiration time.