//解锁
1.sqlplus /nolog
2.conn /as sysdba
3.alter user 用户名 identified by 密码;
4.解锁
alter user 用户名 account unlock;
select username,profile from dba_users where username='用户名';
//修改数据库密码为不限
ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;
//查询数据库密码是否到期
SELECT * FROM dba_profiles s WHERE s.profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME';