rman删除备份集失败：

1、备份软件：networker

2、删除命令:delete noprompt obsolete；

报错：

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== 

RMAN-00571: =========================================================== 

RMAN-03002: failure of delete command at 26/09/2019 12:04:21 

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

3、处理：

1、allocate channel for maintenance device type 'SBT_TAPE' PARMS='ENV=（NSR_ENV=(NSR_SERVER=bst-xxxx,NSR_CLIENT=bst-xxx,NSR_DATA_VOLUME_POOL=ddvexxx,NSR_LOG_VOLUME_POOL=ddvexxx)';

设置后重新删除删除不了，报同样错误