title: Oracle service does not exist in Windows service(Toad information: "ORA-12541: TNS: no listener")
body: <p>I am using Windows 10 Pro and Oracle. 11.2.0.I have a problem, Oracle service does not exist in Windows service.<br>
  I have not used oracle for a long time, and today when I use toad to open Oracle, I was told </p>
  
  <blockquote>
    <p>ORA-12541: TNS: no listener</p>
  </blockquote>
  
  <p>and then I found that Oracle service does not exist in Windows service.</p>