ORA-16820: fast-start failover observer is no longer observing this database
Cause: A previously started observer was no longer actively observing this database. A significant amount of time elapsed since this database last heard from the observer. Possible reasons were:
– The host where the observer was running was not available.
– The network connection between the observer and this database was not available.
– The observer process was terminated unexpectedly.
Action: Check the reason why the observer cannot contact this database. If the problem cannot be corrected, stop the current observer by connecting to the Data Guard configuration and issue the DGMGRL STOP OBSERVER command. Then, restart the observer on another host. Finally, use the DGMGRL START OBSERVER command to start the observer on the other host.
ORA-16820是Oracle数据库错误号，表明fast-start failover observer不再观察该数据库。
1.客户端计算机崩溃，导致数据库中断。
2.网络故障，导致数据库中断。
3.数据库运行不正常，导致数据库中断。
1.检查数据库是否存在故障或不正常的操作。
2.通过调试工具检查客户端计算机或网络状态，确认是否存在问题。
3.根据相应的错误信息更改和配置fast-start observer，确保能够正常观察数据库。
4.检查fast-start observer是否正常运行，如果存在问题，可能需要重新启动observer。