We are having 18.104.22.168 EE running on rhel 7.2.
We have configured daily Rman compressed backups in a particular mount point as
per below script. No channel is configured to take on particular location.
backup as compressed backupset full database tag FULL format
'/oracle_backups/backup/rman/full/db01_LVL0_%T_%U_FULL' database includ
e current controlfile;
We observed that if the mount point is unable to sustain the backup piece for
space constraints, it creates the backup piece in $ORACLE_HOME/dbs or FRA
location as observed for other databases.
But no such setting was configured or could be seen in v$rman_configuration.
Couldn't get any such info in oracle support or 12c documentation.
It might be new feature, as rman is proactively changing mount point as per
mount point space free and required for backup piece.
Any links to documentation or such configuration info would be helpful.