Oracle 11g忘记SYS和SYSTEM密码怎么办，答案很简单：修改密码！

1.首先使用操作系统方式认证登陆SYS账户，修改SYSTEM账户密码。

$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Fri Mar 20 14:23:41 2015

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
 With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
 Data Mining and Real Application Testing options
 
 SQL> show user;
 USER is "SYS"
 SQL> alter user SYSTEM identified by "oracle123";
 
 User altered.
 

 SQL> exit

2.使用SQLPLUS远程登录方式登陆SYSTEM账户，修改SYS账户密码。

$ sqlplus SYSTEM@orcl

SQL*Plus: Release 11.2.0.4.0 Production on Fri Mar 20 14:22:35 2015

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Enter password:

Connected to:
 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
 With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
 Data Mining and Real Application Testing options
 
 SQL> show user;
 USER is "SYSTEM"
 SQL> alter user SYS identified by "Oracle123";
 
 User altered. 

 SQL> exit

至此，大功告成，使用远程登录方式尽情登陆吧~

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