请教各位大师，DG发生故障，主备库已经恢复，能够正常同步，但是dgbroker状态不对，提示备库需要reinstate，然后reinstate备库失败，日志里提示，Reinstatement is not possible if there are insufficient flashback logs
This database may need be to be re-created from a copy
of the new primary database if the flashback issue cannot be resolved.如果不想再重建备库，有没有办法停止observer和fast-start failover?现在都无法停止也无法恢复