Oracle 10g忘记system,sys,sysman密码解决方案

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　　C:\Documents and Settings\Administrator>sqlplus /nolog
　　SQL*Plus: Release 10.1.0.2.0 - Production on 星期六 12月 26 11:08:34 2010
　　Copyright （c） 1982, 2004, Oracle.  All rights reserved.
　　SQL> conn /as sysdba
　　Connected.
　　SQL> alter user system identified by “123456”;
　　User altered.
　　SQL> alter user sys identified by “123456”;
　　User altered.
　　SQL> alter user system identified by “123456”;
　　User altered.
　　SQL> exit
　　Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Pr
　　oduction
　　With the Partitioning, OLAP and Data Mining options
　　C:\Documents and Settings\Administrator>sqlplus
　　SQL*Plus: Release 10.1.0.2.0 - Production on 星期六 6月 26 11:11:34 2010
　　Copyright （c） 1982, 2004, Oracle.  All rights reserved.
　　Enter user-name: system
　　Enter password:
　　Connected to:
　　Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production
　　With the Partitioning, OLAP and Data Mining options
　　SQL>  select instance_name from v$instance;
　　INSTANCE_NAME
　　--------------------------------
　　orcl