title: Oracle error on startup "another startup/shutdown operation of this instance in progress"
body: <p>I made a mistake in starting my local oracle instance. I did not set the <code>oracle_sid</code> before issuing <code>sqlplus "sys as sysdba"</code> and <code>SQL&gt; startup</code>. Now I am unable to startup my instance. Please help me know how to shutdown the erroneous instance. Thanks.</p>