Enterprise AI Re-Skilling & Internals
Semantic Caching with Redis
Semantic caching stores answers keyed by meaning rather than exact text, so near-duplicate prompts skip the model and return instantly. Redis plus vector search makes this practical, but only if you handle similarity thresholds, staleness, and cache invalidation deliberately.
Points clés
- Embed the prompt and search for near matches above a tuned similarity threshold.
- Store the original prompt, embedding, response, and metadata in Redis.
- Set TTLs based on how fast the underlying answer changes.
- Invalidate or version cache entries when prompts, models, or data change.
- Log cache hits and misses to tune thresholds and measure savings.
- Guard against caching personalized or sensitive responses.
- Combine exact-match and semantic layers for best hit rates.
- Fall back to the model on cache miss with no added latency penalty.
Questions fréquentes
What similarity threshold should I use?
Start around 0.9 and tune against your traffic; too low returns wrong answers, too high misses savings.
Does semantic caching hurt freshness?
Only if TTLs are too long; align expiry with how often answers change.
Is it worth it for low traffic?
Often no; the embedding and search overhead can exceed model cost at small scale.
How do I handle user-specific answers?
Key the cache by user or scope, or skip caching entirely for personalized outputs.
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