sqlplus / as sysdba
SQL*Plus: Release 10.2.0.4.0 - Production on Tue Jun 24 12:32:12 2013
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Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Connected.
SQL> select status from v$instance;
select status from v$instance;
*
ERROR at line 1:
ORA-01012: not logged on