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Cause:
Previous channel not released
Solution:
Just restart from rman session and try again
RMAN> exit
rman target /
and try again
...................
RMAN> run
{
allocate channel ch1 device type disk;
BACKUP INCREMENTAL FROM SCN 3459834 DATABASE FORMAT '/ora_work/rman/ORCL1P/ForStandby_%U' tag 'FORSTANDBY';
}
allocated channel: ch1
channel ch1: SID=50 device type=DISK
Starting backup at 04-MAR-21
using channel ORA_SBT_TAPE_1
released channel: ORA_SBT_TAPE_1
released channel: ORA_SBT_TAPE_2
released channel: ch1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 03/04/2021 09:12:53
ORA-19568: a device is already allocated to this session
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