Replica and Consistency Models (ANSWERED)
Read replicas, eventual consistency after upserts, quorum writes, and RAG staleness expectations.
TL;DR — Quick Answer
Vector DBs typically use primary-replica async replication for read scaling; upserts may be eventually visible on replicas seconds later. Strong consistency on every query is rare due to ANN index merge delays. Design RAG SLAs accepting brief staleness or route critical reads to primary after writes.
The Interview Question
Explain replication and consistency options for vector databases serving production search workloads.
Deep Explanation
Replication goals
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