ORA-19568: a device is already allocated to this session

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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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