为提高效率，提问时请提供以下信息，问题描述清晰可优先响应。
【DM版本】:
【操作系统】：
【CPU】:
【问题描述】*：```language
#数据库切换到mount状态
SQL> checkpoint(100);
DMSQL executed successfully
used time: 2.610(ms). Execute id is 1163.
SQL> alter database mount;
executed successfully
used time: 3.119(ms). Execute id is 0.

#dmrman备份数据库
[dmdba@localhost ~]$ dmrman
dmrman V8
RMAN> backup database '/dmdb8/dmdata/fuwa/dm.ini';
backup database '/dmdb8/dmdata/fuwa/dm.ini';
file dm.key not found, use default license!
[-137]:DM server is running or exist other process which is operating the same database