使用Oracle Database 11g可以创建新类型的Interval分区表，Interval类型分区表，可以根据加载数据，自动创建指定间隔的分区。

比如创建按月分区的分区表：Create table intervalpart

(c1 number, c2 varchar2(10) , c3 date)

partition by range (c3)

interval(numtoyminterval(1,'MONTH'))

(

partition part1 values less than (to_date('09/15/2007','MM/DD/YYYY')),

partition part2 values less than (to_date('10/15/2007','MM/DD/YYYY')),

partition part3 values less than (to_date('11/15/2007','MM/DD/YYYY'))

)

/

注意如果你的INTERVAL指定错误，则数据库会报出如下错误：ORA-14752: Interval expression is not a constant of the correct type

下面创建一个以天为间隔的分区表：SQL> create table sales

2 (

3 sales_id number,

4 sales_dt date

5 )

6 partition by range (sales_dt)

7 INTERVAL (NUMTODSINTERVAL(1,'day'))

8 (

9 partition p090101 values less than (to_date('2009-01-01','yyyy-mm-dd'))

10 );

Table created.

SQL> select table_name,partition_name from user_tab_partitions;

TABLE_NAME PARTITION_NAME

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

SALES P090101

SYS_FBA_HIST_16585 HIGH_PART

插入测试数据：SQL> begin

2 for i in 1 .. 35 loop

3 insert into sales values(i,trunc(sysdate,'YYYY')+i);

4 end loop;

5 commit;

6 end;

7 /

PL/SQL procedure successfully completed.

观察自动创建的分区：SQL> select table_name,partition_name from user_tab_partitions;

TABLE_NAME PARTITION_NAME

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

SALES SYS_P47

SALES SYS_P48

SALES SYS_P49

SALES SYS_P50

SALES SYS_P51

SALES SYS_P52

SALES SYS_P53

SALES SYS_P54

SALES SYS_P55

SALES P090101

SALES SYS_P21

TABLE_NAME PARTITION_NAME

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

SALES SYS_P22

SALES SYS_P23

SALES SYS_P24

SALES SYS_P25

SALES SYS_P26

SALES SYS_P27

SALES SYS_P28

SALES SYS_P29

SALES SYS_P30

SALES SYS_P31

SALES SYS_P32

TABLE_NAME PARTITION_NAME

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

SALES SYS_P33

SALES SYS_P34

SALES SYS_P35

SALES SYS_P36

SALES SYS_P37

SALES SYS_P38

SALES SYS_P39

SALES SYS_P40

SALES SYS_P41

SALES SYS_P42

SALES SYS_P43

TABLE_NAME PARTITION_NAME

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

SALES SYS_P44

SALES SYS_P45

SALES SYS_P46

SYS_FBA_HIST_16585 HIGH_PART

37 rows selected.

SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';

Session altered.

SQL> select * from sales partition (sys_p44) ;

SALES_ID SALES_DT

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

24 2009-01-25 00:00:00

SQL> select * from sales partition (sys_p33);

SALES_ID SALES_DT

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

13 2009-01-14 00:00:00

SQL> select * from sales partition (sys_p46);

SALES_ID SALES_DT

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

26 2009-01-27 00:00:00

这一特性极大简化了分区表的维护工作。