Oracle DBMS_ROWID 與 ORA-01446 說明

 

 

一網友說參考個人Blog，執行SQL 報錯：

http://blog.csdn.net/tianlesoftware/article/details/6529346

 

SELECTROWID,

      DBMS_ROWID.rowid_relative_fno (ROWID)rel_fno,

      DBMS_ROWID.rowid_block_number (ROWID)blockno,

      DBMS_ROWID.rowid_row_number (ROWID)rowno

 FROMuser_objects

 WHEREobject_id =100;

 

selectrowid,dbms_rowid.rowid_relative_fno(rowid)rel_fno,dbms_rowid.rowid_block_number(rowid)blockno,dbms_rowid.rowid_row_number(rowid)rowno fromuser_objects where  object_id=100

      *

ERRORatline 1:

ORA-01446:cannot selectROWIDfrom,orsample,aviewwithDISTINCT,GROUPBY,etc.

 

[oracle@dave ~]$ oerr ora 1446

01446, 00000, "cannot select ROWID from, orsample, a view with DISTINCT, GROUP BY, etc."

// *Cause:

// *Action:

[oracle@dave ~]$

 

開始我掃了一眼，覺得和版本或者bug有關係，由於這個SQL我也執行過不少，一直都沒有遇到過問題。

 

在MOS上搜了一下，還真找到2個相關的Bug：

（1）10.2.0.5以後的版本，可能遇到這個bug：

ORA-1445 or ORA-1446 Referencing ROWID from a Viewwith Subquery (文檔 ID 1364607.1)

 

（2）Oracle12.0.0的，可能遇到這個bug：

Select from AR_LOCATION_VALUES_DFV ErrorsORA-01446: Cannot Select Rowid From, Or Sample, A View With Distinct (文檔 ID 980435.1)

 

但這裏明顯和咱們的狀況不符不符合。又仔細看了一眼，知道緣由在哪了：

 

下面是我Blog裏的原SQL:

SQL> SELECT

  2    dbms_rowid.rowid_relative_fno(rowid)REL_FNO,

  3    dbms_rowid.rowid_block_number(rowid)BLOCKNO,

  4    empno, ename

  5  FROM emp WHERE empno =7369;

 

   REL_FNO    BLOCKNO      EMPNOENAME

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

4         20       7369SMITH

 

 

 

網頁的SQL:

SELECTROWID,

      DBMS_ROWID.rowid_relative_fno (ROWID)rel_fno,

      DBMS_ROWID.rowid_block_number (ROWID)blockno,

      DBMS_ROWID.rowid_row_number (ROWID)rowno

 FROMuser_objects

 WHEREobject_id =100;

 

他查詢的是user_objects 視圖，而非物理表。

 

因此咱們這裏的錯誤：

ORA-01446:cannot selectROWIDfrom,orsample,aviewwithDISTINCT,GROUPBY,etc.

 

就是由於USER_OBJECTS 視圖裏的代碼致使的。

 

採用實際的物理表，就不會出現這種問題：

 

SQL> create table dave as select * from dba_objects;

Table created.

 

SQL> SELECT

  2    dbms_rowid.rowid_relative_fno(rowid)REL_FNO,

  3    dbms_rowid.rowid_block_number(rowid)BLOCKNO,

  4    dbms_rowid.rowid_row_number(rowid) ROWNO,

  5    OBJECT_NAME

  6  FROM dave WHERE OBJECT_ID = 20;

 

  REL_FNO    BLOCKNO      ROWNO    OBJECT_NAME                                                                    

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

    1          92737          0        ICOL$

 

 

 

 

 

 

 

 

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