ORA-14450: attempt to access a transactional temp table already in use

在ORACLE數據中修改會話級臨時表時，有可能會遇到ORA-14550錯誤，那麼爲何會話級全局臨時表會報ORA-14450錯誤呢，以下所示，咱們先從一個小小案例入手：

案例1：

SQL> CREATE GLOBAL TEMPORARY TABLE TEMP_TEST

  2  (

  3     NAME VARCHAR2(12)

  4  ) ON COMMIT PRESERVE ROWS;

Table created.

SQL> INSERT INTO TEMP_TEST VALUES('kerry');

1 row created.

SQL> COMMIT;

Commit complete.

SQL> ALTER TABLE TEMP_TEST ADD SEX NUMBER(1) ;

ALTER TABLE TEMP_TEST ADD SEX NUMBER(1)

*

ERROR at line 1:

ORA-14450: attempt to access a transactional temp table already in use

如上所示，修改會話級臨時表時遇到了ORA-14450錯誤，那麼有哪些解決方法呢？ 這時須要斷開會話或執行TRUNCATE語句：

SQL> TRUNCATE TABLE TEMP_TEST;

Table truncated.

SQL>  ALTER TABLE TEMP_TEST ADD SEX NUMBER(1) ;

Table altered.

SQL>

以下所示，咱們模擬一個會話在操做臨時表TEMP_TEST， 另一個會話準備修改它，以下所示（實際場景可能更復雜，可能涉及多個會話而不是僅僅兩個會話）

會話1：

SQL> SET SQLPROMPT "SQLSESSION 1 >"

SQLSESSION 1 >CREATE GLOBAL TEMPORARY TABLE TEMP_TEST

  2           (

  3              NAME VARCHAR2(12)

  4           ) ON COMMIT PRESERVE ROWS;

Table created.

SQLSESSION 1 >INSERT INTO TEMP_TEST VALUES('kerry');

1 row created.

SQLSESSION 1 >COMMIT;

Commit complete.

SQLSESSION 1 >

會話2：:

SQL> SET SQLPROMPT "SESSION 2 >"

SESSION 2 >ALTER TABLE TEMP_TEST ADD SEX NUMBER(1) ;

ALTER TABLE TEMP_TEST ADD SEX NUMBER(1)

*

ERROR at line 1:

ORA-14450: attempt to access a transactional temp table already in use

SESSION 2 >

那麼此時，會話1是其它用戶登陸的。好比應用程序等，你不可能要求全部會話都去執行TRUNCATE操做，這個時候該怎麼處理呢？

此時你能夠使用下面步驟解決這個問題。

Step 一、以sys或system登陸數據庫，先從DBA_OBJECTS中查詢到該表的OBJECT_ID:

SELECT OWNER, OBJECT_ID,OBJECT_TYPE 

  FROM DBA_OBJECTS 

    WHERE OBJECT_NAME=&OBJECT_NAME AND OBJECT_TYPE ='TABLE';

Step 二、根據查到的OBJECT_ID知道使用該表的SESSION：

SELECT ADDR, KADDR, SID,LMODE FROM V$LOCK WHERE ID1=&OBJECT_ID;

Step 三、經過下面SQL找到對應的會話並生成KILL SESSION的執行語句

SET COL kill_session FOR A80;

select a.sid, a.serial#,a.status,

       a.paddr, 'alter system kill session ''' 

                    || a.sid || ',' || a.serial# 

                    || ''' immediate;' AS kill_session

FROM v$session a

WHERE a.sid in (select sid from v$enqueue_lock t where t.type='TO') 

  and a.sid=&sid;

Step 四、查看會話狀態，並執行ALTER SYSTEM KILL SESSION語句殺掉這些進程:

具體操做步驟，以下截圖所示：　

緣由: 查看ORA-14450的錯誤，你能夠看到以下信息：

[oracle@oracle-server ~]$ oerr ora 1445014450, 00000, "attempt to access a transactional temp table already in use"// *Cause:  An attempt was made to access a transactional temporary table that//          has been already populated by a concurrent transaction of the same//          session.// *Action: do not attempt to access the temporary table until the//          concurrent transaction has committed or aborted.