Of course, RMAN can be run without connecting to any of the databases by executing the RMAN.EXE file or by typing the RMAN command at the prompt.

RMAN

You can also exit by using the EXIT command.

EXIT

As well as connecting to three types of databases:

1 - Target Database:

The target database is the database being targeted, and it can be connected using the following command:

RMAN TARGET /

:Recovery Catalog Database - 2

RMAN TARGET /    CATALOG RMAN/RMAN

We will discuss later how to create a Recovery Catalog Database, but it should be noted that backup and recovery can be performed without connecting to the Recovery Catalog Database.

The information related to the backups is stored in the Control File of the target database.

3- Auxiliary Database :-

RMAN TARGET / CATALOG RMAN/RMAN@CAT AUXILIARY SYSTEM/SYS@AUX

It is not necessary to connect to the Auxiliary Database to complete the backup and recovery process, as it is a helper database that we may need later for reasons mentioned previously.