Milvus
Vector databasesAn open-source vector database built for billion-scale similarity search.
Milvus is a vector database engineered for scale: distributed architecture, multiple index types, and the ability to handle billions of vectors with high query throughput.
That power comes with operational weight — it is a real distributed system — which is justified when the scale genuinely demands it.
Where it's ideally used
A fit when vector search must operate at very large scale, into the billions of vectors.
Where it doesn't fit
Operationally heavy — overkill for the small and medium workloads that most RAG projects actually have.