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开发人员告诉我在使用基于事物的临时表的时候报了下面错误:ORA-14450: attempt to access a transactional temp table already
开发人员告诉我在使用基于事物的临时表的时候报了下面错误:
ORA-14450: attempt to access a transactional temp table already in use
下面根据实验模拟了2种临时表使用不当报ORA-1445O的原因:
1)基于事物的临时表
SQL> create global temporary table temp_tab on commit delete rows as select 'a' as a1 from dual;
Table created.
SQL> select sid from v$mystat where rownum=1;
SID
----------
191
SQL> insert into temp_tab values ('b');
1 row created.
SQL>
在191回话不做commit,打开另外一个session 执行ddl(如果在同一会话可以成功执行ddl语句)
SQL> alter table temp_tab add b1 varchar2(10);
alter table temp_tab add b1 varchar2(10)
*
ERROR at line 1:
ORA-14450: attempt to access a transactional temp table already in use
SQL> select sid from v$mystat where rownum=1;
SID
----------
40
SQL>
返回session 191 执行自定义事物
SQL> declare
2 pragma autonomous_transaction;
3 begin
4 insert into temp_tab values ('c');
5 commit;
6 end;
7 /
declare
*
ERROR at line 1:
ORA-14450: attempt to access a transactional temp table already in use
ORA-06512: at line 4
2)基于session 的临时表
SQL> drop table temp_tab purge;
Table dropped.
SQL> create global temporary table temp_tab on commit preserve rows as select 'a' as a1 from dual;
Table created.
SQL> select sid from v$mystat where rownum=1;
SID
----------
191
SQL> insert into temp_tab values ('a');
1 row created.
SQL> alter table temp_tab add b1 varchar2(10);
alter table temp_tab add b1 varchar2(10)
*
ERROR at line 1:
ORA-14450: attempt to access a transactional temp table already in use
SQL> select * from temp_tab;
A
-
a
a
SQL> commit;
Commit complete.
SQL> alter table temp_tab add b1 varchar2(10);
alter table temp_tab add b1 varchar2(10)
*
ERROR at line 1:
ORA-14450: attempt to access a transactional temp table already in use
上面实验可以看出基于session 的临时表在同一个session内运行一个事物,无论是提交还是未提交都不能做ddl操作
再运行一个事物,不提交到另外一个session做ddl报错同样错误
SQL> delete from temp_tab;
2 rows deleted.
SQL> select sid from v$mystat where rownum=1;
SID
----------
40
SQL> alter table temp_tab add b1 varchar2(10);
alter table temp_tab add b1 varchar2(10)
*
ERROR at line 1:
ORA-14450: attempt to access a transactional temp table already in use
提交之后,在另外session测试发现还是无法ddl
SQL> commit;
Commit complete.
退出session,仅有一个会话做ddl
SQL> alter table temp_tab add b1 varchar2(10);
Table altered.
总结:
a, 基于transaction的临时表在同一个session里面不允许做自定义事物,并且若在一个session里面运行了一条事物未做提交,在另外一个session无法做ddl操作
b, 基于session的临时表若在某一个sesson里面运行了事物,任何session都不运行做ddl包括运行该事物的session
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