If you have more than one drive and volume in your system, you can use the Number of Channels (Streams) option on the Backup Manager to enhance the performance of your backups. After you allocate a certain number of channels to be used for the backup, the agent and RMAN determine how the multiple channels are organized and distributed, and whether all the channels you specified are necessary. In some cases, RMAN may determine that instead of using all the channels you specified, the backup job could be better accomplished by sequentially packaging more than one job (backup piece) per channel, and as a result will use a smaller number of channels for the job.
Note: Previous releases of the agent used the Multistreaming option on the Destination tab to accomplish this type of backup. The Number of Channels (Streams) option replaces the Multistreaming option and provides better integration with RMAN, which allows RMAN to handle the multistreaming process rather than the agent. Beginning with this release, the Multistreaming option in the Backup Manager is ignored for Oracle jobs.
Important! After specifying more than one channel in the Backup Manager, avoid selecting a specific media or media device group on the Destination tab as this prevents multistreaming from occurring.
The number of devices or device groups available on your system dictates the number of jobs RMAN runs simultaneously. For more information about multistreaming, see the Administration Guide.
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