Oracle 解除对SCOTT/TIGER用户的锁定
1、查证目前系统对于SCOTT用户的状态：
select * from dba_users where upper(username)='SCOTT';
ACCOUNT_STATUS:EXPIRED & LOCKED
2、解除对于SCOTT用户的锁定：
conn sys/bitservice@ttonline as sysdba;
alter user scott account unlock;
select * from dba_users where upper(username)='SCOTT';
ACCOUNT_STATUS:EXPIRED
3、连接SCOTT用户：
conn scott/tiger@ttonline;提示该用户已经过期，请重新输入新的密码：tiger
conn scott/tiger@ttonline;此次可以正常连接此用户。
4、查看SCOTT用户的状态：
conn sys/bitservice@ttonline as sysdba;
select * from dba_users where upper(username)='SCOTT';
ACCOUNT_STATUS:OPEN
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