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Real-Time RAG with Fresh Data (EXPLAINED)

Scenario BasedRAGHard25 min read

Hard RAG interview question on real-time rag with fresh data — architecture, trade-offs, eval, and production patterns.

TL;DR — Quick Answer

Stream CDC into the vector index; expose freshness metadata in prompts; use short TTL caches at query time. For live facts (stock price, inventory), augment RAG with tool/API calls rather than waiting for index lag.

The Interview Question

Explain real-time rag with fresh data. How would you design, implement, and evaluate this in a production RAG system? Discuss trade-offs and failure modes.

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