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Recovery Manager Architecture

Recovery Manager Architecture

The Recovery Manager environment consists of the various applications and databases that play a role in a backup and recovery strategy.
Component Description
RMAN client The client application that manages backup and recovery operations for a target database. The RMAN client can use Oracle Net to connect to a target database, so it can be located on any host that is connected to the target host through Oracle Net.
Target database A database containing the control files, data files, and optional archived redo logs that RMAN backs up or restores. RMAN uses the target database control file together metadata about the target database and to store information about its own operations. The work of backup and recovery is performed by server sessions running on the target database.
Recovery catalog database A database containing a recovery catalog, which contains metadata that RMAN uses to perform backup and recovery. You can create one recovery catalog that contains the RMAN metadata for multiple target databases. Unless you are using RMAN with a physical standby database, a recovery catalog is optional when using RMAN because RMAN stores its metadata in the control file of each target database.
Recovery catalog schema The user within the recovery catalog database that owns the metadata tables maintained by RMAN. RMAN periodically propagates metadata from the target
database control file into the recovery catalog.
The only required components in an RMAN environment are a target database and RMAN client, but most real-world configurations are more complicated. For example, you use an RMAN client connecting to multiple media managers and multiple target databases and auxiliary databases, all accessed through Enterprise Manager.
duplicate database A copy of the primary database that you can use for testing purposes. The DBID is different from the database from which it was created.
fast recovery area A disk location that you can use to store recovery-related files such as control file and online redo log copies, archived redo logs, flashback logs, and RMAN backups. Oracle Database and RMAN manage the files in the fast recovery area automatically.
media manager A vendor-specific application that enables RMAN to back up to a storage system such as tape
media management catalog A vendor-specific repository of metadata about a media management application
RMAN Command-Line Client
Use the RMAN command-line client to enter commands that you can use to manage all aspects of backup and recovery operations. RMAN uses a command language interpreter that can execute commands in interactive or batch mode. Even when you use the backup and recovery features in Enterprise Manager that are built on top of RMAN, an RMAN client executes behind the scenes.
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