TNS-12522：TNS
错误码
错误描述：TNS
错误原因：There are not any available and appropriate database instances registered with the listener, that are part of the service identified by SERVICE_NAME given in the connect descriptor and that have the specified INSTANCE_ROLE (and INSTANCE_NAME, if specified).
解决方法：Check to make sure that the INSTANCE_ROLE specified is correct. Run "lsnrctl services" to ensure that the instance(s) have registered with the listener and that they are ready to accept connections.
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