Redis

How does Redis handle cache invalidation in production systems?

The question is about Redis .

Answer:
Redis manages cache invalidation mainly through three methods: TTL-based expiry which automatically expires each key using EXPIRE or SETEX; explicit deletion which removes specific keys when the underlying data changes; and keyspace notifications that alert subscribing services to key expiry or deletion events. The most effective strategy in production combines TTL expiry for time-sensitive data with explicit invalidation upon data updates to avoid serving stale cache.

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