sqlplus / as sysdba
登錄數據庫以最高權限登錄
SQL*Plus: Release 11.2.0.1.0 Production on Thu Apr 11 09:00:05 2019
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL> show user;
產看當前登錄用戶
USER is "SYS"
SQL> startup
啓動數據庫
ORACLE instance started.
Total System Global Area 784998400 bytes
Fixed Size 2217464 bytes
Variable Size 482347528 bytes
Database Buffers 293601280 bytes
Redo Buffers 6832128 bytes
Database mounted.
Database opened.
SQL> select username, account_status from dba_users order by username;
查看OracleDBA_USER視圖
DBA_USERS視圖中ACCOUNT_STATUS記錄的用戶的當前狀態，一般情況下在使用的正常用戶均處於OPEN狀態。
例如我們查看sec用戶的當前狀態，此時該用戶處於OPEN狀態，可以正常使用。
| USERNAME | ACCOUNT_STATUS | 狀態 |
|---|---|---|
| ANONYMOUS | EXPIRED & LOCKED | 此時狀態爲過期並且鎖住 |
| APEX_030200 | EXPIRED & LOCKED | |
| APEX_PUBLIC_USER | EXPIRED & LOCKED | |
| APPQOSSYS | EXPIRED & LOCKED | |
| BI | EXPIRED & LOCKED | |
| CTXSYS | EXPIRED & LOCKED | |
| DBSNMP | OPEN | 開放的 |
| DIP | EXPIRED & LOCKED | |
| EXFSYS | EXPIRED & LOCKED | |
| FLOWS_FILES | EXPIRED & LOCKED | |
| HR | EXPIRED | 過期的 |
| IX | EXPIRED & LOCKED | |
| MDDATA | EXPIRED & LOCKED | |
| MDSYS | EXPIRED & LOCKED | |
| MGMT_VIEW | OPEN | |
| OE | EXPIRED & LOCKED | |
| OLAPSYS | EXPIRED & LOCKED | |
| ORACLE_OCM | EXPIRED & LOCKED | |
| ORDDATA | EXPIRED & LOCKED | |
| ORDPLUGINS | EXPIRED & LOCKED | |
| ORDSYS | EXPIRED & LOCKED | |
| OUTLN | EXPIRED & LOCKED | |
| OWBSYS | EXPIRED & LOCKED | |
| OWBSYS_AUDIT | EXPIRED & LOCKED | |
| PM | EXPIRED & LOCKED | |
| SCOTT | OPEN | |
| SH | EXPIRED & LOCKED | |
| SI_INFORMTN_SCHEMA | EXPIRED & LOCKED | |
| SPATIAL_CSW_ADMIN_USR | EXPIRED & LOCKED | |
| SPATIAL_WFS_ADMIN_USR | EXPIRED & LOCKED | |
| SYS | OPEN | |
| SYSMAN | OPEN | |
| SYSTEM | OPEN | |
| WMSYS | EXPIRED & LOCKED | |
| XDB | EXPIRED & LOCKED | |
| XS$NULL | EXPIRED & LOCKED |
SQL> alter user hr account unlock;
更改用戶hr帳戶爲未鎖
SQL> alter user hr identified by hr;
更改用戶hr密碼爲hr
SQL> conn hr /hr
切換用爲hr/密碼爲hr
Connected.
SQL> show user
查看當前登錄賬號
USER is "HR"
SQL>