Exam AI-200 Topic 1 Question 51 Discussion

Actual exam question for Microsoft's AI-200 exam
Question #: 51
Topic #: 1
You are developing an AI search API that caches semantic search results in Redis.
Search results must remain cached for 10 minutes. If the underlying data changes, cached entries must NOT be returned.
You need to implement a cache-aside strategy to ensure data consistency.
Which two actions should you perform? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

Suggested Answer: B,D Vote an answer

Delete keys on mutation. Implement an event-driven or database-hook system to purge related Redis keys the moment the source data updates.
Use absolute expiration. Set a strict, un-extendable Time-To-Live (TTL) of 10 minutes when writing to the cache, ensuring the data naturally expires even if a deletion event is missed.
Incorrect:
[Not C]
Implementing a sliding expiration is not a good step for this specific architecture because it violates the requirement that entries must not be returned if the underlying data changes.
Reference:
https://medium.com/real-world-net/net-caching-strategies-compared-redis-vs-memory-vs-hybrid-b8b8be1e708d

by Honey at Jul 31, 2026, 01:39 AM

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