RMAN is an Oracle Database client that performs backup and recovery tasks on your databases and automates administration of your backup strategies.
RMAN tool integrates with sessions running on an Oracle database to perform a range of backup and recovery activities, including maintaining an RMAN repository of historical data about backups
RMAN gives you access to several backup and recovery techniques and features not available with user-managed backup and recovery. The most noteworthy are the following:
Automatic specification of files to include in a backup: Establishes the name and locations of all files to be backed up.
Maintain backup repository: Backups are recorded in the control file, which is the main repository of RMAN metadata. Additionally, you can store this metadata in a recovery catalog,
Incremental backups Incremental backup stores only blocks changed since a previous backup. Thus, they provide more compact backups and faster recovery, thereby reducing the need to apply redo during datafile media recovery.
Unused block compression: In unused block compression, RMAN can skip data blocks that have never been used
Block media recovery: You an repair a data file with only a small number of corrupt data blocks without taking it offline or restoring it from backup.
Binary compression A binary compression mechanism integrated into Oracle Database reduces the size of backups.
Encrypted backups: RMAN uses backup encryption capabilities integrated into Oracle Database to store backup sets in an encrypted format.
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