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…RMAN Components
Recovery Catalog
- Optional
- Secondary location for RMAN repository
- Primary location is target database control file
- Contains backup metadata
Media Management Library
- Required if backing up to tape
- Communicates with server session on target database
- Reads and Writes to tape
Notes:
The recovery catalog is a series of tables and view owned by a single user (typically called “RMAN”) populated with backup and recovery information for one or more databases. After creating the catalog in the RMAN schema, you’ll notice a series of views starting with “RC_”. These are the recovery catalog views; these views can be queried for information on backups. Since the target database’s control file also contains this information, this is an optional component. However, it is recommended. See more in the section “The Recovery Catalog, To Use, Or Not To Use”.
Oracle and RMAN do not come with the ability to directly read and write to tape. You must install compliant software, called a “media management library”, from a tape software vendor. Oracle ships with an free but scaled down MML from Legato (e.g. the tape drive must reside on the server). For a list of vendors supplying MML’s visit:
http://otn.oracle.com/deploy/availability/htdocs/bsp.htm.