Oracle 11g用户修改密码及加锁解锁功能实例代码

alter user identityName identified by password; ―?C修改密码 
alter user identityName account unlock; ―?C解锁 
alter user identityName account lock; ―?C加锁 
identityName:需要修改的用户； 
password：新设密码；

SQL> conn sys/sys as sysdba
Connected.
SQL> show user
USER is "SYS"
SQL> alter user hr account unlock;（解锁）
User altered.
SQL> alter user hr identified by *password*;（更改密码，这一步是必需的，否则hr模式还是不能使用的）
User altered.
到这里hr模式就可以使用了,试试：
SQL> conn hr/*password*
Connected.
SQL> show user
USER is "HR"
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相反的
SQL> alter user hr account lock;（上锁）
User altered.
SQL> alter user hr password expire;（密码失效）
User altered.
SQL> conn hr/*password*
ERROR:
ORA-28000: the account is locked
Warning: You are no longer connected to ORACLE.