Multi-Tenant Vector Index Isolation Strategies (EXPLAINED)
Hard vector DB question on tenant isolation, noisy neighbors, and ACL safety.
TL;DR — Quick Answer
Prefer hard isolation (per-tenant collection/namespace) for strong security and noisy-neighbor control; use metadata filters only within a trusted boundary. Hybrid approaches are common: namespaces per large tenant, shared indexes with mandatory tenant filters for long-tail tenants — always enforce ACL in application code too.
The Interview Question
Compare namespace isolation, separate collections, and metadata filters for multi-tenant vector search. Which would you choose for a SaaS RAG product?
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