The -um option allows you to connect to the DBLauncher.app instance, if it is running, and displays messages in a new window within DBLauncher.app. The -um option must be used with the other options required to start the database server. Server messages appear in this
window instead of in the shell. Closing this window shuts down the database server. If a connection to the DBLauncher.app instance cannot be established, the database server does not start.
For the database server to connect to a DBLauncher.app instance, both must be running in the same Mac OS X security context. For example, a database server started from an ssh
session cannot find a DBLauncher.app instance that was started by Launch Services.