ORA-16890：database does not have a valid fast-start failover target standby database in observe-only mode
错误码
错误描述：database does not have a valid fast-start failover target standby database in observe-only mode
错误原因：Fast-start failover was enabled in observe-only mode and the current primary database did not have a value set for the FastStartFailoverTarget configurable property or the value specified for this property was not a valid fast-start failover target standby database.
解决方法：Disable fast-start failover or ensure that the primary database has a valid fast-start failover target standby database specified by setting the FastStartFailoverTarget configurable property value to a valid standby database.
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