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Oracle® Database Backup and Recovery Advanced User's Guide
10g Release 2 (10.2)

Part Number B14191-01
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Configuring and Allocating Channels for Use in Backups

You have the following options for executing backups:

The easiest way to make backups is to configure automatic channels. For example, so long as you have already configured an sbt device type, you can configure a default sbt channel as follows (note that the PARMS value is vendor-specific) and then back up the database using these defaults:

RMAN> CONFIGURE DEVICE TYPE sbt PARALLELISM 1;
RMAN> CONFIGURE DEFAULT DEVICE TYPE TO sbt;
RMAN> CONFIGURE CHANNEL DEVICE TYPE sbt PARMS 'ENV=(NSR_SERVER=bksvr1)';
RMAN> BACKUP DATABASE;

RMAN preconfigures a DISK channel for you, so you can make disk backups using automatic channels without performing any configuration whatsoever.

The other method is to allocate channels manually within a RUN block before running the BACKUP command. For example, this command allocates multiple disk channels and then backs up the database and archived redo logs:

RMAN> RUN
{ 
  ALLOCATE CHANNEL ch1 DEVICE TYPE DISK;
  ALLOCATE CHANNEL ch2 DEVICE TYPE DISK;
  ALLOCATE CHANNEL ch3 DEVICE TYPE DISK;
  BACKUP DATABASE PLUS ARCHIVELOG;
}

The following example manually allocates an sbt channel (with a vendor-specific PARMS value) and backs up a datafile copy:

RMAN> RUN
{ 
  ALLOCATE CHANNEL ch1 DEVICE TYPE sbt PARMS 'ENV=(NSR_SERVER=bksvr1)';
  BACKUP DATAFILECOPY '/tmp/system01.dbf';
}

Most examples in this chapter assume that you have configured automatic channels.