1.首先使用操作系統方式認證登陸SYS賬戶，修改SYSTEM賬戶密碼。
$ 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
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如果密碼忘記了，更改密碼的步驟如下：
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2.使用SQLPLUS遠程登錄方式登陸SYSTEM賬戶，修改SYS賬戶密碼。
$ 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
