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RMAN
RMAN is an Oracle utility that helps you manage the backup, restore an recovery operations on Oracle databases. RMAN has a powerful command language that is independent of the operating system.
RMAN has a command-line interface. Oracle Enterprise Manager also provides a graphical user interface for the RMAN. RMAN can be used on databases of Oracle8 or higher releases.
RMAN Components
  • Recovery Manager Executable: The RMAN command-line interface is invoked through the RMAN client application. RMAN interprets user commands and appropriately invokes server sessions to perform the desired tasks.

  • Enterprise Manager: The EM Database Control console supplies a graphical interface to the most commonly used RMAN functionality.

  • Server Sessions: The server process (UNIX) and threads (Windows NT) invoked by RMAN connect to the target database to perform the backup, restore and recovery functions through a PL/SQL interface. These sssions read or write files to or from disk, tape, or the Flash Recovery Area, a storage location specified as the default storage area for files related to database recovery.

  • Target Database: The database for which backup and recovery operations being performed using RMAN is called the target database. The control file of the target database contains information about its physical structure, such as the size and location of data files, online and archived redo log files, and control files. This information is used by the server sessions invoked by RMAN in backup and recovery operations.

  • Auxiliary Database: An auxiliary database is used when creating a duplicate database or performing tablespac point-in-time recovery (TSPITR). An auxiliary database can reside on the same host as its parent or an a different host.

  • Channel: To perform backup and recovery operations, RMAN requires a link to the target database. The link is referred to as a channel. You can allocate channels manually or preconfigure channels using automatic channel allocation.

  • RMAN Repository: RMAN maintains metadata about the target database and its backup and recovery operations in the RMAN repository. Among other things, RMAN stores information about its own configuration settings, the target database schema, archived redo logs, and all backup files on disk or tape. RMAN repository data is always stored in the target database.

  • Recovery Catalog: The recovery catalog is a schema that is created in a seperate database. It contains the metadata obtained from the target database control file. RMAN propagates information about the database structure, archived redo logs, backup sets, and datafile copies into the recovery catalog from the control file of the target database. A single recovery catalog is able to store information for multiple target databases.

How to create a Recovery Catalog

  • Media Management Library (MML): The MML is used by RMAN when writing to or reading from tapes. The additional media management software required for using the tape medium is provided by media and storage system vendors.
Posted by Raghu Kiran R Goli

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