Whenever a database is started on a server, it is assigned a database name, either by the administrator by using the -n option,
or by the database server by using the base of the file name with the extension and path removed.
Connect to a running database
If the database you want to connect to is already running, use the DatabaseName (DBN) connection parameter. A connection
only occurs if the name of the running database matches database-name.
To connect to the utility database, use the database name utility_db.
The DatabaseName (DBN) connection parameter is recommended over the DatabaseFile (DBF) connection parameter when you want
to prevent any attempt to start the database if it is not already running.
Start a database that is not running
If you specify both the DatabaseName (DBN) and DatabaseFile (DBF) connection parameters, an attempt is made to connect
to a running database with the specified database name (the DatabaseFile connection parameter is ignored), and if that fails,
an attempt is made to start the database automatically using the path indicated by the DatabaseFile connection parameter and
assign it the name specified by the DatabaseName connection parameter.
The DatabaseName (DBN) connection parameter is recommended for naming databases, rather than using the DatabaseSwitches (DBS)
connection parameter with the -n option or the START connection parameter with the -n option.