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12523, 00000, "TNS:listener could not find instance appropriate for the client connection"
// *Cause: The listener could not find any available (database) instances,
// that are appropriate for the client connection.
// *Action: Run "lsnrctl services" to ensure that the instance(s) are
// registered with the listener, and have status READY.
运行lsnrctl services 看看isntance的服务是否已经注册。
看看isntance是否已经启动,如果已经启动,还没有注册
可以试试alter system register 注册试试。