In some environments, it may not be possible to bring down the entire database to perform an offline backup. In such situations, you can choose online backups, where the database will be up and running during the backup.
You can perform either a full backup or incremental backup of the Oracle database when it is online. Since full backups includes all the datafiles, tablespaces and logs, it is very time consuming, hence you can plan for a full online backup less frequently (say, on weekly basis). On the other hand, incremental backups includes the data and logs that have been changed after the last full backup, they are faster and can be performed more frequently (say, on a daily basis).
If a new database object is added to the database, and if none of the subclients contain that database object , then that object is assigned to the content of the default subclient
Before You Begin
Optional: You can have data and log backups use different compression. If you want to use the MediaAgent for compression for log backups, see Enabling MediaAgent Compression for Oracle or Oracle RAC Log Backups.
Procedure
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From the CommCell Browser, expand Client Computers > client > Oracle RAC.
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Right-click the instance, point to All Tasks and then click New Subclient.
The Create New Subclient dialog box appears.
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On the General tab, in the Subclient Name box, enter a name for the subclient.
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On the Content tab, select the Online Database option.
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On the Storage Device tab from the Data Storage Policy list, select the storage policy that the software uses for data backups.
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Click OK.