临时表 on commit delete rows 与 on commit preserve rows 的区别

-- 事务级临时表：提交时删除数据

create global temporary  table tmp_table1

(

       x     number

) on commit delete rows ;

-- 会话级临时表：会话结束时删除数据

create global temporary table tmp_table2

(

       x     number

) on commit preserve rows ;

insert into tmp_table1

values(1);

insert into tmp_table1

values(2);

insert into tmp_table1

values(3);

insert into tmp_table2

values(1);

insert into tmp_table2

values(2);

insert into tmp_table2

values(3);

select * from   tmp_table1 ;

X

1

2

3

select * from   tmp_table2 ;

X

1

2

3

commit;

select * from   tmp_table1 ;

-- 无结果输出

select * from   tmp_table2 ;

X

1

2

3

SQL> conn / as sysdba;

SQL> select * from   user01.tmp_table1 ;

-- 无结果输出 

SQL> select * from   user01.tmp_table2 ;

-- 无结果输出