"Common cache invalidation algorithms: Time-based after a certain period of time; Version-based whenever version changes; Delta-based - compare the current version with the latest version and invalidate if the delta between the two exceeds a certain threshold; Least Recently Used (LRU) - the item not accessed for the longest time is evicted from the cache; Least Frequently Used (LFU) - the item accessed the least is evicted from the cache. Of course caches can combine multiple algorithms"
