[oracle@dg1 ~]$ sqlplus /nolog

SQL*Plus: Release 10.2.0.1.0 - Production on Mon May 11 12:51:24 2009

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

SQL> conn / as sysdba

Connected to an idle instance.

SQL> startup

ORACLE instance started.

Total System Global Area  167772160 bytes

Fixed Size                  1218316 bytes

Variable Size              79694068 bytes

Database Buffers           83886080 bytes

Redo Buffers                2973696 bytes

Database mounted.

Database opened.

SQL>