Oracle 11g下自动创建分区

11g之前，维护分区需要手工。11g之后使用interval来实现自动扩展分区，简化了维护。

根据年  INTERVAL(NUMTOYMINTERVAL(1,‘YEAR‘))

根据月  INTERVAL(NUMTOYMINTERVAL(1,‘MONTH‘))

根据天  INTERVAL(NUMTODSINTERVAL(1,‘DAY‘))

下面用按月自动扩展来做个试验：

SQL> create table t_range (id number not null PRIMARY KEY, test_date date)

partition by range (test_date) interval (numtoyMinterval (1,‘MONTH‘))

(

partition p_2014_01_01 values less than (to_date(‘2014-01-01‘, ‘yyyy-mm-dd‘))

);

--看到只有一个分区

SQL> select partition_name from user_tab_partitions where table_name=‘T_RANGE‘;

PARTITION_NAME

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

P_2014_01_01

SQL> insert /*+append */ into t_range  select rownum,

to_date(to_char(sysdate - 140, ‘J‘) +

trunc(dbms_random.value(0, 80)),

‘J‘)

from dual

connect by rownum <= 100000;

SQL> commit;

--可以看到SYS开头的分区是自动扩展的

SQL> select partition_name from user_tab_partitions where table_name=‘T_RANGE‘;

PARTITION_NAME

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

P_2014_01_01

SYS_P21

SYS_P22

SYS_P23

--再看看t_range的表结构

create table T_RANGE

(

ID        NUMBER not null,

TEST_DATE DATE

)

partition by range (TEST_DATE)

(

partition P_2014_01_01 values less than (TO_DATE(‘ 2014-01-01 00:00:00‘,

‘SYYYY-MM-DD HH24:MI:SS‘, ‘NLS_CALENDAR=GREGORIAN‘)),

partition SYS_P21 values less than (TO_DATE(‘ 2014-02-01 00:00:00‘,

‘SYYYY-MM-DD HH24:MI:SS‘, ‘NLS_CALENDAR=GREGORIAN‘)),

partition SYS_P22 values less than (TO_DATE(‘ 2014-03-01 00:00:00‘,

‘SYYYY-MM-DD HH24:MI:SS‘, ‘NLS_CALENDAR=GREGORIAN‘)),

partition SYS_P23 values less than (TO_DATE(‘ 2014-04-01 00:00:00‘,

‘SYYYY-MM-DD HH24:MI:SS‘, ‘NLS_CALENDAR=GREGORIAN‘))

);

-- Create/Recreate primary, unique and foreign key constraints

alter table T_RANGE

add primary key (ID);

--如果对分区名不太爽，则可以自己修改一下：

alter table t_range rename partition SYS_P21 to p_2014_02_01;

alter table t_range rename partition SYS_P22 to p_2014_03_01;

alter table t_range rename partition SYS_P23 to p_2014_04_01;

Oracle 11g下自动创建分区