Hi,

Sometimes You can get “RMAN-06091: no channel allocated for maintenance (of an appropriate type)  ” error.

RMAN-06091: no channel allocated for maintenance

Details of error are as follows.

RMAN-06091: no channel allocated for maintenance (of an appropriate type)

Cause: A command was entered that requires a maintenance channel, and no maintenance channel is allocated, or none of the appropriate type.


Action: Use ALLOCATE CHANNEL FOR MAINTENANCE before deleting backup pieces, or using the CROSSCHECK or DELETE

EXPIRED commands. Proxy copies require a non-DISK channel.

RMAN-06091 no channel allocated for maintenance (of an appropriate type)

This error is related with the reported in Bug 28391990, which has been superseded by the fix of unpublished Bug 28432129:

Bug 28432129: RMAN-06091: no channel allocated for maintenance (of an appropriate type) after installing July 2018 (DBPSU/BP/RU) (Note 28432129.8)
Fixed Version : 19.1

To solve this error, you should delete the obsolete backups as follows.

If you are using the Tape backup, then run the following commands.

RMAN> allocate channel for maintenance device type 'sbt_tape' PARMS 'ENV=(NSR_SERVER=, NSR_CLIENT=)';

RMAN> delete obsolete;

RMAN> crosscheck archivelog all;

RMAN> delete archivelog all backed up 2 times to sbt_tape;

RMAN> crosscheck archivelog all;

If you are using the Disk backup, then run the following commands.

RMAN> allocate channel for maintenance device type disk;

RMAN> delete obsolete device type disk;

RMAN> crosscheck archivelog all;

RMAN> delete archivelog all backed up 2 times to disk;

RMAN> crosscheck archivelog all;

Do you want to learn more details about RMAN, then read the following articles.

RMAN Tutorial | Backup, Restore and Recovery Tutorials For Beginner Oracle DBA