Polyglot

 

EF Core – Combining SQL and NoSQL databases for better performance

https://www.thereformedprogrammer.net/ef-core-combining-sql-and-nosql-databases-for-better-performance/

uses RavenDB but it looks like a very good article on the subject.

Also have a look at Veena Sarda's article on c# corner

https://www.c-sharpcorner.com/article/need-of-polyglot-persistence/