title: Install Oracle DB on Linux
body: <p>I'm trying to install Oracle DB on Linux.
  This is my first attempt, so don't judge me too hard.</p>
  
  <p>I've run into a problem when creating a DB via DBCA:</p>
  
  <blockquote>
    <p>Error starting Database Control. Please execute the following
    command(s).</p>
    
    <p>1) Set the environment variable <code>ORACLE_UNQNAME</code> to Database unique name</p>
    
    <p>2) <code>/u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl start
    dbconsole</code></p>
  </blockquote>
  
  <p>Am I doing something wrong? Shall I continue or step back and do something?</p>
  
  <p>Why I'm asking: I see that installation program hasn't set <code>ORACLE_HOME</code> variable as <code>echo $ORACLE_HOME</code> under oracle user displays an empty string. I remember that on Windows it is set automatically. So, am I missing a step here?</p>
  
  <p>In common: on installing oracle software and DB, shall I perform specific steps to set ORACLE-related environment variables? Or it should be set automatically?</p>