C:\Users\Administrator>echo %ORACLE_SID%%ORACLE_SID%C:\Users\Administrator>set ORACLE_SID=orclC:\Users\Administrator>sqlplus / as sysdbaSQL*Plus: Release 11.2.0.1.0 Production on 星期日 9月 25 09:04:20 2016Copyright (c) 1982, 2010, Oracle.  All rights reserved.连接到:Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - ProductionWith the Partitioning, OLAP, Data Mining and Real Application Testing optionsSQL> alter user system identified by 123456;