Multiuser Database Design

You can work with database diagrams in a multiuser environment; that is, an environment in which more than one user at a time may make changes to a database diagram and the database. When you save a diagram, the Database Designer verifies that the database has not been modified since you last saved the diagram. If another user has made changes, you will be notified that the database has been modified. You may need to reconcile these changes, both in the database diagram and in the database itself.