Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.4.0
Connected as xx@xxxxxx
SQL> SELECT username,PROFILE FROM dba_users; 
sql>SELECT * FROM dba_profiles s WHERE s.profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME'; 
将密码有效期由默认的180天修改成“无限制”:
sql>ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED; 
修改之后不需要重启动数据库,会立即生效。