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;