RMAN-12001: could not open channel ch01
RMAN-10008: could not create channel context
RMAN-10003: unable to connect to target database
ORA-12170: TNS:Connect timeout occurred；
查看了一下监听的状态发现状态是启动的，但不显示监听的实例，建议用户把监听重启一下，如果能解决，再更新。
RMAN-12001: could not open channel ch01
RMAN-10008: could not create channel context
RMAN-10003: unable to connect to target database
ORA-12170: TNS:Connect timeout occurred；
查看了一下监听的状态发现状态是启动的，但不显示监听的实例，建议用户把监听重启一下，如果能解决，再更新。