The Security database was introduced in 9.1 and contains all tables related to membership. Sitecore supplies a script for separating the Security database away from the Core database.
You can host the Security database on:
Refer to the Sitecore compatibility table for compatible versions.
The Security database has its place in the Sitecore reference structure. It can be referenced by other roles, and it can also reference other roles.
The Security database is referenced by the following roles:
The Security database does not reference other roles.
Privacy and security
The Security database handles personal data in the following ways:
It stores ASP.NET membership details, including usernames, passwords, and custom user profile data.