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

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

alter user system identified by manager;

2）用户被锁定，解锁

ALTER USER username ACCOUNT UNLOCK;

重启cmd，再次登录验证，成功