Caching keys without TTL causes unbounded memory growth

Storing cache keys without expiration causes indefinite accumulation over time, leading to unbounded memory growth, increased eviction pressure, and out-of-memory errors. Keys added without TTLs because "data never changes" persist even after assumptions change, causing unpredictable eviction behavior.

Sources

• https://redis.io/tutorials/redis-anti-patterns-every-developer-should-avoid/?hmsr=joyk.com
• https://www.c-sharpcorner.com/article/redis-anti-patterns-common-mistakes-that-break-performance-reliability-and-tr/

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