Hi Jordan,
When you register a database as the server�??s managed database, the data is always copied to this database if you publish a service with feature access enabled. If you use data from this registered database in a map and publish it, it will still be copied to the server. If you want the service to reference the data, you would need to register the database as shared. You cannot register the same database as the server�??s managed database and shared. It has to be one or the other. It is recommended that you have a dedicated database to act as the server�??s managed database versus reusing data from this same database to author maps for publishing.
Joanne