如果sys密码忘记的时候可以用下面的这个两种方法来修改。
[oracle@node2 ~]$ sqlplus / ' as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Wed May 11 16:48:45 2011
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Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> alter user sys identified by test1;
User altered.
SQL> alter user system identified by test1;
User altered.
SQL>