Basic, but somewhat interesting segmentation of the database market (from a report on Couchbase).

I'm not sure if I get the placement for all these (e.g. wouldn't Snowflake be in relational / analytical). Anyway, it's a crowded market for sure (see below).

The key is the flattening of the relational market, and the rise of the others.

(Data is from Aug 16, 2021 report from William Blair on Couchbase. Sorry no public report available).