incremental backup RMAN with multiple channels

below is the command in oracle to take rman incremental backup.

RMAN> run

{

   allocate channel c1  device type disk format 'I:\RMAN_BACKUP\rman_bkp_%U';

   allocate channel c2  device type disk format 'I:\RMAN_BACKUP\rman_bkp_%U';

   allocate channel c3  device type disk format 'I:\RMAN_BACKUP\rman_bkp_%U';

   backup incremental from scn 5768934213 database;

}

where 'rman_bkp_%U' is format of backup piece whose name will start with 'rman_bkp'.

above command used to allocate multiple channels to take incremental backup.

If you want to take incremental backup with single channel then below is the command which is executed using rman utitlity.

RMAN > backup device type disk incremental from scn 5768934213 database format 'I:\RMAN_BACKUP\rman_bkp_%U';

scn specifies from where to start backup.

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