ظهور الرساله 12514 عند محاوله  الدخول فى بيئه ال sql على الرغم من انى كنت اتمكن من الدخول ال الsql بشكل ممتاز ..... ارجو المساعده والشرح .... شكرا جزيلا ...

 

 

Action:

- Wait a moment and try to connect a second time.

- Check which services are currently known by the listener by executing: lsnrctl services <listener name>

- Check that the SERVICE_NAME parameter in the connect descriptor of the net service name used specifies a service known by the listener.

- If an easy connect naming connect identifier was used, check that the service name specified is a service known by the listener.

- Check for an event in the listener.log file.