$ sqlplus /nolog
SQL*Plus: Release 10.2.0.5.0 – Production on Mon Aug 13 11:55:43 2012
Copyright (c) 1982, 2010, Oracle. All Rights Reserved.
SQL> conn /as sysdba
Connected.
SQL>alter user system identified by password
用户已更改
SQL>alter user sys identified by password
用户已更改
SQL> exit
