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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