The utility database is a phantom database with no physical representation. The utility database has no database file, and therefore it cannot contain data. This feature allows you to:
Execute database file administration statements such as CREATE DATABASE without first connecting to an existing physical database.
Retrieve values of connection properties and server properties using the utility database.
Connect to a running database server when it is not possible to connect to the database. For example, in a mirroring system, you can connect to the utility database to stop a mirroring server or force a database to become the primary server.
The utility database is named utility_db. If you attempt to create or start a database with this name, the operation fails.
The utility database has one user named DBA. The password for the DBA user is set using the -su database server option. You can use the -su database server option to set the utility database password for the DBA user, or to disable connections to the utility database. If the -su option is not specified when starting the utility database, then the user ID and password requirements are different for the personal server and the network server.
You can start the utility database on a database server by specifying utility_db as the database name when connecting to the server.
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