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Oracle RMAN Tips

Oracle Database Tips by Donald Burleson

Oracle Recovery Manager (RMAN) replaced the enterprise backup utility (EBU) with a more robust method for managing backups.  RMAN is complex and it is critical that you have attended a Oracle RMAN Backup & Recovery Class.

Explanation of RMAN Terminology

This section presents definitions of the RMAN terms used in the subsequent sections of this chapter:
  • RMAN TARGET DATABASE - An RMAN Target Database is the primary database that will be backed up for RAC Grid creation. In RMAN's terminology, the term target database identifies the database that is undergoing a backup, restore or recovery operation by the RMAN Recovery Manager.

  • RMAN AUXILIARY DATABASE - An Auxiliary Database is a RAC Grid that will be created as a result of the duplication of the target database. In RMAN's terminology, Auxiliary instance identifies an instance which RMAN connects in order to execute the duplicate command.

  • RMAN CHANNEL - An RMAN Channel is a communication pipeline between a RMAN executable and a target or auxiliary database. An RMAN channel consists of a server session on the target or auxiliary database and a data stream from the database to the backup device or vice-versa. RMAN console sends commands to the database using this channel, and the server session running on the database executes the command on behalf of the RMAN Recovery Manager.

  • RMAN AUTOMATIC CHANNEL ALLOCATION - RMAN Channels can be configured to use a set of default attributes for each operation when a channel is not allocated manually. By default, RMAN configures a channel of device type, DISK, to be used for automatic channel allocation.

  • RMAN MANUAL CHANNEL ALLOCATION - As the name suggests, a channel can be configured manually for special needs such as increasing the degree of parallelism. Channels can be allocated manually by using the ALLOCATE CHANNEL command in the RUN block of RMAN statement.

Also, see my notes on the different backup types and the differences between incremental cumulative and incremental differential backups.

My other notes on RMAN include:

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