SQL*Plus: Release 11.1.0.7.0 - Production on Fri Jan 18 10:08:44 2013
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Connected.
SQL> select * from v$instance;
select * from v$instance
*
ERROR at line 1:
ORA-01012: not logged on
Process ID: 0
Session ID: 0 Serial number: 0
SQL> show parameter;
ORA-01012: not logged on
Process ID: 0
Session ID: 0 Serial number: 0