RMAN-06091 no channel allocated for maintenance

denglj

系统：CentOS7.4

数据库：11.2.0.4

run块语句如下：

run{
allocate channel c1 device type disk;
allocate channel c2 device type disk;
allocate channel c3 device type disk;
report obsolete;
crosscheck backup;
delete noprompt obsolete;
backup as compressed backupset database format‘/dbbak/db_%U.bak’ plus archivelog format ‘/dbbak/arc_%U.bak’;
backup current controlfile format ‘/dbbak/ctl_%U.bak’;
delete noprompt archivelog until time ‘sysdate-14’;
release channel c1;
release channel c2;
release channel c3;
}

异常描述：在执行rman备份时，报错RMAN-06091，如下所示：

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