ORA-24544：Oracle RAC One Node instance is already running.
错误码
错误描述：Oracle RAC One Node instance is already running.
错误原因：An instance startup failed because an instance of the Oracle RAC One Node database was already running on one of the cluster nodes.
解决方法：In Oracle RAC One Node, avoid any attempt to start a second instance by any means while the instance is already running.
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