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

在ORACLE数据中修改会话级临时表时，有可能会遇到ORA-14550错误，那么为何会话级全局临时表会报ORA-14450错误呢，以下所示，咱们先从一个小小案例入手：

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，修改会话级临时表时遇到了ORA-14450错误，那么有哪些解决方法呢？ 这时须要断开会话或执行TRUNCATE语句：

SQL> TRUNCATE TABLE TEMP_TEST;

Table truncated.

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

Table altered.

SQL>

以下所示，咱们模拟一个会话在操做临时表TEMP_TEST， 另一个会话准备修改它，以下所示（实际场景可能更复杂，可能涉及多个会话而不是仅仅两个会话）

会话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 >

会话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 >

那么此时，会话1是其它用户登陆的。好比应用程序等，你不可能要求全部会话都去执行TRUNCATE操做，这个时候该怎么处理呢？

此时你能够使用下面步骤解决这个问题。

Step 一、以sys或system登陆数据库，先从DBA_OBJECTS中查询到该表的OBJECT_ID:

SELECT OWNER, OBJECT_ID,OBJECT_TYPE 

  FROM DBA_OBJECTS 

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

Step 二、根据查到的OBJECT_ID知道使用该表的SESSION：

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

Step 三、经过下面SQL找到对应的会话并生成KILL SESSION的执行语句

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、查看会话状态，并执行ALTER SYSTEM KILL SESSION语句杀掉这些进程:

具体操做步骤，以下截图所示：　

缘由: 查看ORA-14450的错误，你能够看到以下信息：

[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.