环境：Linux
操作语句：
[oracle@ora11r2 ~]$ sqlplus /nolog
SQL*Plus: Release 11.1.0.6.0 - Production on Thu Jun 10 18:22:16 2010
Copyright (c) 1982, 2007, Oracle. All rights reserved.
SQL> startup
ORA-01031: insufficient privileges
SQL> quit
[oracle@ora11r2 ~]$ sqlplus / as sysdba --得用dba登录才行，汗。。。。。
SQL*Plus: Release 11.1.0.6.0 - Production on Thu Jun 10 18:25:14 2010
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 422670336 bytes
Fixed Size 1300352 bytes
Variable Size 243271808 bytes
Database Buffers 171966464 bytes
Redo Buffers 6131712 bytes
Database mounted.
Database opened.
SQL>