Database / Milvus Vector database Interview questions
How do you implement multi-tenancy in Milvus?
Milvus supports multi-tenancy at a few different levels of isolation, and the right choice depends on how many tenants exist and how strictly their data needs to be separated.
| Approach | Best for |
| Partition per tenant | Many tenants sharing a schema, where lightweight logical isolation within one collection suffices. |
| Collection per tenant | Fewer tenants needing stronger isolation, or tenants with differing schemas. |
| Database per tenant (multi-database feature) | Tenants needing separate namespaces for collections, users, and permissions. |
| Resource groups | Isolating the actual compute (Query Node) resources serving different tenants, avoiding noisy-neighbor effects. |
Partition-per-tenant is generally the most resource-efficient approach when tenant count is high, since Milvus is designed to handle a large number of collections and partitions efficiently; collection-per-tenant or full database-per-tenant approaches trade some of that efficiency for stronger isolation guarantees, which matters more for tenants with strict data-separation requirements or meaningfully different access patterns.
Partition-per-tenant is generally the most resource-efficient approach when:
Resource groups in Milvus are used to:
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