SQL> select username, account_status from dba_users;
USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
SYS OPEN
SYSTEM OPEN
OUTLN EXPIRED & LOCKED
MGMT_VIEW EXPIRED & LOCKED
FLOWS_FILES EXPIRED & LOCKED
MDSYS EXPIRED & LOCKED
ORDSYS EXPIRED & LOCKED
EXFSYS EXPIRED & LOCKED
DBSNMP EXPIRED & LOCKED
WMSYS EXPIRED & LOCKED
APPQOSSYS EXPIRED & LOCKED
USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
APEX_030200 EXPIRED & LOCKED
OWBSYS_AUDIT EXPIRED & LOCKED
ORDDATA EXPIRED & LOCKED
CTXSYS EXPIRED & LOCKED
ANONYMOUS EXPIRED & LOCKED
SYSMAN EXPIRED & LOCKED
XDB EXPIRED & LOCKED
ORDPLUGINS EXPIRED & LOCKED
OWBSYS EXPIRED & LOCKED
SI_INFORMTN_SCHEMA EXPIRED & LOCKED
OLAPSYS EXPIRED & LOCKED
USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
SCOTT EXPIRED & LOCKED
ORACLE_OCM EXPIRED & LOCKED
XS$NULL EXPIRED & LOCKED
BI EXPIRED & LOCKED
PM EXPIRED & LOCKED
MDDATA EXPIRED & LOCKED
IX EXPIRED & LOCKED
SH EXPIRED & LOCKED
DIP EXPIRED & LOCKED
OE EXPIRED & LOCKED
APEX_PUBLIC_USER EXPIRED & LOCKED
USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
HR EXPIRED & LOCKED
SPATIAL_CSW_ADMIN_USR EXPIRED & LOCKED
SPATIAL_WFS_ADMIN_USR EXPIRED & LOCKED
36 rows selected.
SQL> alter user scott account unlock;
User altered.
SQL> alter user scott identified by tiger;
User altered.
SQL>
注释：
oracle 的用户信息都在dba_users表中，
默认只有sys、和sysdba 两个用户是open的，
alter user scott account unlock; 这个命令是给scott用户解锁，
alter user scott identified by tiger; 这个命令是给scott用户设置密码，
通过这两个语句,scott 用户就可以使用了。
其它用户同理可用。
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