Adding Custom DB for Reporting

Hello CRM Users:

For CRM on-prem I have heard of people creating a custom DB on the same instance that CRM is installed for the purpose of creating store procedures.  I even found a few references to it on-line.  What I am not clear on is how to grant permissions to the custom DB so that CRM users can run reports.

The goal is to have the custom DB so that I can write stored procedures for reports.  I will use the filtered views.  The stored procedure will live in the custom DB.  This way I can use SP's but not keep them in the CRM database.

Have any of you done this?

Thanks.