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[oracle@liwei admin]$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Thu May 1 15:55:18 2008
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
Connected to an idle instance.
SQL> quit
Disconnected
[oracle@liwei admin]$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.1.0 - Production on Thu May 1 15:55:24 2008
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
Connected to an idle instance.
SQL> quit
Disconnected
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[oracle@liwei oracle]$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.1.0 - Production on Thu May 1 14:51:59 2008
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
ERROR:
ORA-01031: insufficient privileges
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C:\Documents and Settings\Administrator>sqlplus " / as sysdba"
SQL*Plus: Release 9.2.0.1.0 - Production on Mon May 5 17:54:32 2008
Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.
ERROR:
ORA-01031: insufficient privileges
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