title: DBMS_OUTPUT.PUT_LINE not printing anything
body: <p>When executing the following code, it just says the procedure is completed and doesn't print the infomation . </p>
  
  <pre><code>BEGIN
   dbms_output.put_line('This is my first program');
  END;
  /
  </code></pre>
  
  <p>When I execute the above code the compiler says , PL/SQL procedure successfully completed but doesn't print anything to the console . What can I do ? </p>