4-3. Management Framework

There are three major components of the Oracle database management framework:

• The database instance that is being managed
• A listener that allows connections to the database
• The management interface. This may be either a management agent running on the database server (which connects it to Oracle Enterprise Manager Grid Control) or the stand-alone Oracle Enterprise Manager Database Control. this is also referred to as Database Console.

Each of these componenets must be explicitly started before you can use the services of the component and must be shut down cleanly when shutting down the server hosting the Oracle database.

Start up order is important. these components must be started in this order:

1. Management interface. After this is activated, it can be used to start the other components. Use emctl start dbconsole
2. Database instance. Either from dbconsole or executing STARTUP command within SQL*PLUS
3. Listener. Notice that the listener could actually be started before the database instance but there is no point of starting a listener if there is no instance running. Use lsnrctl start