修改oracle系统用户system的密码

C:\Users\Administrator>echo %ORACLE_SID%
%ORACLE_SID%

C:\Users\Administrator>set ORACLE_SID=orcl

C:\Users\Administrator>sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on 星期日 9月 25 09:04:20 2016

Copyright (c) 1982, 2010, Oracle.  All rights reserved.


连接到:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> alter user system identified by 123456;