There are three options under the Database menu option:
Manage Connections – Launches the DB Connection Editor, which allows you to create and manage multiple connections.
Reverse Engineering – Create a model from an existing database. For more information, see Section 6.5.9.2, “Reverse Engineering a Live Database”.
Forward Engineering – Create a database from a model. For more information, see Section 6.5.10.2, “Forward Engineering to a Live Server”.
Synchronize Model – Synchronize your database model with an existing database. For more information, see Section 6.5.10.3, “Database Synchronization”.
Generate Catalog Diff Report – Compare your schema model with a live database or a script file. Section 6.5.10.4, “Creating a Catalog Diff Report”.