Managing Oracle instances
The NetBackup Discovery Service (nbdisco) discovers Oracle database instances throughout the NetBackup environment. All of the instances that are manually added or NetBackup discovers are populated in the Instance tab table.
All instances that you want backed up as part of an Oracle Intelligent Policy must be registered with credentials. Instance management lets you assign credentials to individual instances as well as instance groups. The instances in an instance group share the same set of credentials. You can direct the discovery service to assign the new instances that it discovers to an instance group. The Oracle database user is required to have a certain level of credentials. The Oracle database user must have SYSBACKUP or SYSDBA privileges (based on version of Oracle).
Note:
After an instance is associated with an Oracle RAC database, it no longer shows up as a single instance. The instance does show up if the instance was registered before it was associated with the Oracle RAC database. The instance is removed from the instance list after it's associated with an Oracle RAC unless it was previously registered.