[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>