报错：ORA-01017（：用户名/口令无效; 登录被拒绝）

1.打开CMD命令窗，输入sqlplus / as sysdba
2.再输入conn / as sysdba

1）修改密码
SQL>alter user 用户名 identified by 密码

2）用户被锁定，解锁
查询是否被锁
select username, account_status, lock_date from dba_users;
oracle解锁用户
ALTER USER username ACCOUNT UNLOCK;