ORA-12521：TNS
错误码
错误描述：TNS
错误原因：The listener received a request to establish a connection to a database or other service. The connect descriptor received by the listener specified in addition to the service name an instance name for an instance (usually a database instance) that either has not yet dynamically registered with the listener or has not been statically configured for the listener. This may be a temporary condition such as after the listener has started, but before the database instance has registered with the listener.
解决方法：- Wait a moment and try to connect a second time.- Check which instances are currently known by the listener by executing: lsnrctl services listener name- Check that the INSTANCE_NAME parameter in the connect descriptor specifies an instance name known by the listener.- Check for an event in the listener.log file.
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