title: getting erro as "connected to an idle instance" oracle
body: <p>I have two oracle DB's, but I am getting "idle instance in primary db as below
  Also db1 is working fine. </p>
  
  <pre>
  [oracle@db1 ~]$ export ORACLE_SID=SPM1
  [oracle@db1 ~]$ sqlplus '/as sysdba'
  
  SQL*Plus: Release 11.2.0.1.0 Production on Wed Aug 20 12:57:25 2014
  
  Copyright (c) 1982, 2009, Oracle.  All rights reserved.
  
  Connected to an idle instance.
  </pre>