(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=db.rmohan.com)(PORT=1521))) The listener supports no services The command completed successfully [oracle@db ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Tue May 20 00:42:10 2014

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Connected to an idle instance.

SQL> select name from v$datafile; select name from v$datafile * ERROR at line 1: ORA-01034: ORACLE […]