Anyone interested in this space should look at https://turbopuffer.com - I think they were first to market with S3 backed vector storage, and a good memory cache in front of it.

Turbopuffer is awesome, really recommend it. Also they have extra features like automatic recall tuning based on you data, option to choose read after write guarantees (trading latency for consistency or vice versa), BM25 search, filtering on the filed and many more.

Really recommend to check them out if you need a vector DB. I tried qdrant and zilli cloud solutions and in terms of operational simplicity turbopuffer just killing it.

https://turbopuffer.com/docs/query

Turbopuffer was mentioned in the article.