Site Subscriptions in SharePoint 2010
New multi-tenancy features are an exciting concept in SharePoint 2010, particularly when considering the implications on hosting SharePoint for a variety of tenants, each requiring some method of partitioning, administration, and a method of reporting and control whether within the boundaries of an Enterprise or as a hosting provider. In this post we’ll look at one of the layers of multi-tenancy in SharePoint 2010.
https://blogs.technet.com/wbaer/archive/2010/05/07/site-subscriptions-in-sharepoint-2010.aspx