What database to choose for a large number of records under ASP NET?

Question

Database

There is a message entity (title, creation date, body, etc.) the message has a one-to-many relationship with the author entity. It is necessary to insert a large number (bulk insert) of new messages and authors into the database, about 15 thousand at a time. You don’t need to receive many messages and authors (20 pieces at a time). What base to use under ASP NET MVC for this task?