DGMGRL>
DGMGRL> show configuration;
Configuration - dg_config
Protection Mode: MaxAvailability
Members:
orcl - Primary database
Error: ORA-16820: fast-start failover observer is no longer observing this database
orcldg - (*) Physical standby database
Error: ORA-16820: fast-start failover observer is no longer observing this database
Fast-Start Failover: ENABLED
Configuration Status:
ERROR (status updated 26 seconds ago)
DGMGRL>
DGMGRL>
DGMGRL> show configuration;
Configuration - dg_config
Protection Mode: MaxAvailability
Members:
orcl - Primary database
Error: ORA-16820: fast-start failover observer is no longer observing this database
orcldg - (*) Physical standby database
Error: ORA-16820: fast-start failover observer is no longer observing this database
Fast-Start Failover: ENABLED
Configuration Status:
ERROR (status updated 20 seconds ago)
DGMGRL> start observer;
[P001 02/27 07:04:10.37] Authentication failed.
DGM-16979: Unable to log on to the primary or standby database as SYSDBA
Failed.
DGMGRL> connect sys/sys ##这里需要注意一下，使用sys用户连接
Connected as SYSDG.
DGMGRL> start observer
Observer started
#再次查看
[root@roidb01 ~]# su - oracle
Last login: Tue Feb 27 06:45:19 CST 2018 on pts/0
<roidb01:orcl:/home/oracle>$dgmgrl /
DGMGRL for Linux: Version 12.1.0.2.0 - 64bit Production
Copyright (c) 2000, 2013, Oracle. All rights reserved.
Welcome to DGMGRL, type "help" for information.
Connected as SYSDG.
DGMGRL> show configuration;
Configuration - dg_config
Protection Mode: MaxAvailability
Members:
orcl - Primary database
orcldg - (*) Physical standby database
Fast-Start Failover: ENABLED
Configuration Status:
SUCCESS (status updated 25 seconds ago)
DGMGRL> 12c broker fast-start failover - ORA-16820解决
原文：http://blog.51cto.com/roidba/2073336