title: why select name from v$database showing only one database?
body: <p>I am learning oracle 10g in school. In the lab we created a db called ORCL. After the lab I successfully created 2 more database. one is HORCL2016 and HORCL 2017. I add both of them on Oracle enterprise manager console. Now Both are showing in the tree. I can connect or disconnect them from the tree. I checked both client/server tnsname.ora and both DB is present.Now when I do  :</p>
  
  <pre><code>select name from v$database 
  </code></pre>
  
  <p>it only shows ORCL. What could be wrong? Any help?</p>
  
  <p><a href="https://i.stack.imgur.com/2kM2L.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2kM2L.png" alt="enter image description here"></a></p>