RMAN Repository - wykład

RMAN Repository
RMAN maintains a record of database files and backups for each database on which it
performs operations. This metadata is called the RMAN repository. When you request
recovery of a database, RMAN uses the repository metadata to choose the most
efficient backups needed for this restore and recovery.
The primary location for the RMAN repository for a database is its control file. The
importance of this metadata for RMAN is one more reason why protecting your
control file is a vital part of your backup strategy. In some installations, a second copy
of the RMAN repository is stored in a schema called the recovery catalog. The
recovery catalog is located in a separate database and can store metadata for multiple
target databases.
It is recommended that you use a recovery catalog. Because a recovery catalog stores
metadata history for longer than the control file, you can perform a recovery that goes
further back in time than the history in the control file. Also, if the target control file
and all backups are lost, then the RMAN metadata in the recovery catalog can be used.
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