Oracle数据库DBA权限回收操作参考

1. 基本操作指令

1、查看当前系统 ORACLE_SID（linux）

# su - oracle
$ cat /etc/oratab
orcl:/oracle/app/oracle/product/11.2.0/dbhome_1:N
crm:/oracle/app/oracle/product/11.2.0/dbhome_1:N

2、查看当前系统 ORACLE_SID（windows）
依次打开【控制面板】—【系统安全】—【管理工具】—【服务】
查找跟OracleService开头的相关服务，比如OracleServiceORCL、OracleServiceCRM等，有几个这样的服务就有几个实例
3、切换ORACLE_SID（linux）

$ echo $ORACLE_SID
orcl
$ export ORACLE_SID=crm
$ echo $ORACLE_SID
crm
$ sqlplus / as sysdba

4、切换ORACLE_SID（windows）

C:\Users\sqluser> sqlplus sys/passwd@crm as sysdba
或者
C:\Users\sqluser> set oracle_sid=crm
C:\Users\sqluser> sqlplus /nolog
SQL> connect /as sysdba  或 SQL> connect sys/passwd@crm as sysdba
SQL> select name from v$database;   或  SQL> select instance_name from v$instance;

2. 权限回收准备工作

备注：先执行如下语句，筛选是否具有DBA权限的用户，如果没有（除sys/system用户外），之后的操作可忽略。

SQL> select * from dba_role_privs where GRANTED_ROLE= 'DBA';
GRANTEE    GRANTED_ROLE        ADM DEF
------------------------------ ------------------------------ --- ---
SYS                DBA                YES YES
SYSTEM             DBA                YES YES

1、统计各个实例下开放使用的用户

SQL> select username from dba_users where account_status='OPEN';
USERNAME
------------------------------
SYS
SYSTEM
ERP
3 rows selected.

2、统计每个用户具有哪些角色权限（dba_role），注意用户名要大写，以用户名ERP举例如下

SQL> select * from dba_role_privs where GRANTEE= 'ERP';
GRANTEE                GRANTED_ROLE           ADM DEF
------------------------------ ------------------------------ --- ---
ERP                DBA                NO  YES
ERP                RESOURCE               NO  YES
ERP                CONNECT                NO  YES

3、统计每个用户具有哪些系统权限（dba_sys），注意用户名要大写，以用户名ERP举例如下

SQL> select * from dba_sys_privs where GRANTEE='ERP';
GRANTEE                PRIVILEGE                ADM
------------------------------ ---------------------------------------- ---
ERP                CREATE ANY SYNONYM           NO
ERP                UNLIMITED TABLESPACE         NO
ERP                CREATE SESSION               NO

3. 操作回收DBA权限

1、回收dba权限

SQL> revoke dba from ERP;
Revoke succeeded

.

2. 重新授权必要权限

SQL> grant connect,resource to ERP;
grant create view to ERP;
grant create public synonym to ERP;
grant drop public synonym to ERP;
grant unlimited tablespace to ERP;
Grant succeeded.

3、确认权限

SQL> select * from dba_role_privs where GRANTEE= 'ERP';
GRANTEE                GRANTED_ROLE           ADM DEF
------------------------------ ------------------------------ --- ---
ERP            CONNECT                NO  YES
ERP            RESOURCE               NO  YES
SQL> select * from dba_sys_privs where GRANTEE='ERP';
GRANTEE                PRIVILEGE                ADM
------------------------------ ---------------------------------------- ---
ERP            CREATE VIEW              NO
ERP            DROP PUBLIC SYNONYM          NO
ERP            CREATE PUBLIC SYNONYM            NO
ERP            UNLIMITED TABLESPACE         NO

4、其他危险的dba角色权限的回收，特别是以DROP ANY、UPDATE ANY、ALTER ANY、ADMINISTER开头的权限，要注意判断并根据情况回收，这里以DROP ANY TABLE举例

SQL> revoke DROP ANY TABLE from ERP;
Revoke succeeded.

4. 注意事项

备注：如果ADM列显示为YES表示该权限拥有WITH ADMIN OPTION（针对系统权限）或WITH GRANT OPTION（针对对象权限），需要对其权限进行回收操作，并重新授权。
举例如下：

1、查询ERP用户具有哪些角色权限（dba_role）

SQL> select * from dba_role_privs where GRANTEE='ERP';
GRANTEE                GRANTED_ROLE           ADM DEF
------------------------------ ------------------------------ --- ---
ERP                CONNECT                YES YES
ERP                AQ_USER_ROLE           YES YES
ERP                RESOURCE               NO  YES

2、回收ADM列为YES的权限，并重新授权

SQL> revoke connect from ERP;
Revoke succeeded.
SQL> revoke AQ_USER_ROLE from ERP;
Revoke succeeded.
SQL> grant connect to ERP;
Grant succeeded.

3、确认权限

SQL> select * from dba_role_privs where GRANTEE='ERP';
GRANTEE                GRANTED_ROLE           ADM DEF
------------------------------ ------------------------------ --- ---
ERP                CONNECT                NO  YES
ERP                AQ_USER_ROLE           NO  YES
ERP                RESOURCE               NO  YES

4、查看是否有dblink，避免因权限回收，导致跨库出现异常

SQL> select * from dba_objects where object_type like '%LINK%';

5. 结束