有時候給一些普通使用者授予查詢系統物件(例如dynamic performance views)許可權時會遇到“ORA-02030: can only select from fixed tables/views”，如下所示：

 

SQL> grant select on v$session to test;

grant select on v$session to test

                *

ERROR at line 1:

ORA-02030: can only select from fixed tables/views

 

 

 

關於ORA-02030錯誤介紹如下，也是就是對於fixed tables 或fixed views只能進行SELECT查詢，不能做SELECT之外的任何操作

 

[[email protected] ~]$ oerr ora 2030

02030, 00000, "can only select from fixed tables/views"

// *Cause: 

An attempt is being made to perform an operation other than

//         a retrieval from a fixed table/view.

// *Action:  You may only select rows from fixed tables/views.

 

關於V$ Views的介紹如下：

 

V$ Views

 

The actual dynamic performance views are identified by the prefix V_$. Public synonyms for these views have the prefix V$. Database administrators and other users should access only the V$ objects, not the V_$ objects.

 

The dynamic performance views are used by Oracle Enterprise Manager, which is the primary interface for accessing information about system performance. After an instance is started, the V$ views that read from memory are accessible. Views that read data from disk require that the database be mounted, and some require that the database be open.

 

我們查詢發現V$SESSION，V$DBLINK都是fixed views，而且v$這類我們經常查的檢視都是v_$開頭檢視的同義詞。

 

SQL> SELECT * FROM V$FIXED_TABLE WHERE NAME IN( 'V$SESSION','V$DBLINK');

NAME                            OBJECT_ID TYPE   TABLE_NUM

------------------------------ ---------- ----- ----------

V$SESSION                      4294950919 VIEW       65537

V$DBLINK                       4294951157 VIEW       65537

SQL> 

SQL> COL OWNER  FOR A12;

SQL> COL OBJECT_NAME FOR A32;

SQL> COL OBJECT_TYPE FOR A32;

SQL> SELECT OWNER, OBJECT_NAME ,OBJECT_TYPE

  2  FROM DBA_OBJECTS 

  3  WHERE OBJECT_NAME='V$SESSION';

OWNER        OBJECT_NAME                      OBJECT_TYPE

------------ -------------------------------- --------------------------------

PUBLIC       V$SESSION                        SYNONYM

SQL> 

SQL> COL TABLE_OWNER FOR A12;

SQL> COL SYNONYM_NAME FOR A20;

SQL> COL TABLE_NAME FOR A16;

SQL> COL DB_LINK FOR A8;

SQL> SELECT * FROM DBA_SYNONYMS WHERE SYNONYM_NAME='V$SESSION';

OWNER        SYNONYM_NAME         TABLE_OWNER  TABLE_NAME       DB_LINK

------------ -------------------- ------------ ---------------- --------

PUBLIC       V$SESSION            SYS          V_$SESSION

 

 

所以要授權就應該執行下面SQL語句

 

SQL>

SQL> GRANT SELECT ON V_$SESSION TO TEST;

Grant succeeded.

 

 

 

 

如果遇到這樣的錯誤，直接找到對應同義詞對應的檢視或基表，然後進行授權，如下所示：

 

SQL> show user;

USER is "SYS"

SQL> grant select on v$dblink to test;

grant select on v$dblink to test

                *

ERROR at line 1:

ORA-02030: can only select from fixed tables/views

SQL> COL OWNER  FOR A12;

SQL> COL OBJECT_NAME FOR A32;

SQL> COL OBJECT_TYPE FOR A32;

SQL> SELECT OWNER, OBJECT_NAME ,OBJECT_TYPE

  2  FROM DBA_OBJECTS 

  3  WHERE OBJECT_NAME=UPPER('v$dblink');

OWNER        OBJECT_NAME                      OBJECT_TYPE

------------ -------------------------------- --------------------------------

PUBLIC       V$DBLINK                         SYNONYM

SQL> COL TABLE_OWNER FOR A12;

SQL> COL SYNONYM_NAME FOR A20;

SQL> COL TABLE_NAME FOR A16;

SQL> COL DB_LINK FOR A8;

SQL> SELECT * FROM DBA_SYNONYMS WHERE SYNONYM_NAME='V$DBLINK';

OWNER        SYNONYM_NAME         TABLE_OWNER  TABLE_NAME       DB_LINK

------------ -------------------- ------------ ---------------- --------

PUBLIC       V$DBLINK             SYS          V_$DBLINK

SQL> grant select on v_$dblink to test;

Grant succeeded.

SQL>