修改oracle系统用户system的密码

C:UsersAdministrator>echo %ORACLE_SID%
%ORACLE_SID%

C:UsersAdministrator>set ORACLE_SID=orcl

C:UsersAdministrator>sqlplus / as sysdba

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

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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;