ORA-16857：member disconnected from redo source for longer than specified threshold
错误码
错误描述：member disconnected from redo source for longer than specified threshold
错误原因：The amount of time the member was disconnected from the redo source exceeded the value specified by the TransportDisconnectedThreshold configurable database property. It is caused by a lack of network connectivity between the redo source and the member.
解决方法：Ensure that there is network connectivity between the redo source and the member and that the redo source is working properly.
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