Question

我有一张2017年和2018年数据表。需要在该表上创建每月分区。

因此，我创建了一个非分区表并从原始表中加载了所有数据。现在我将新表转换为每月分区表。

当我更改为

时出现错误

ORA-14300：分区键映射到超出最大值的分区允许的分区数

我的脚本是

ALTER TABLE ORDERHDR_PART MODIFY 
PARTITION BY RANGE (LASTUPDATE) INTERVAL(NUMTOYMINTERVAL(1, 'MONTH'))
  (
   PARTITION ORDERHDR_PART_JAN VALUES less than (TO_DATE('01-02-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_FEB VALUES less than (TO_DATE('01-03-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_MAR VALUES less than (TO_DATE('01-04-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_APR VALUES less than (TO_DATE('01-05-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_MAY VALUES less than (TO_DATE('01-06-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_JUN VALUES less than (TO_DATE('01-07-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_JUL VALUES less than (TO_DATE('01-08-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_AUG VALUES less than (TO_DATE('01-09-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_SEP VALUES less than (TO_DATE('01-10-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_OCT VALUES less than (TO_DATE('01-11-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_NOV VALUES less than (TO_DATE('01-12-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_DEC VALUES less than (TO_DATE('01-01-2019','DD-MM-YYYY'))
   )ONLINE;

Answer 1

我认为您的方法是错误的。

首先创建一个已分区表，例如

CREATE TABLE ORDERHDR_PART (....)
PARTITION BY RANGE (LASTUPDATE) INTERVAL (NUMTOYMINTERVAL(1, 'MONTH'))
  (
  PARTITION ORDERHDR_INITIAL VALUES less than (DATE '2000-01-01')
  );

然后将现有数据传输到新表。

您可以使用简单的INSERT INTO ORDERHDR_PART SELECT * FROM ORDERHDR_2017; Oracle将根据LASTUPDATE的值自动创建每月分区。使用这种方法，您将（临时）复制数据和/或可能会遇到性能问题。

另一种方法是使用Exchanging Partitions，应该是这样

ALTER TABLE ORDERHDR_PART 
  EXCHANGE PARTITION FOR (DATE '2017-01-01')
  WITH TABLE ORDERHDR_2017
  INCLUDING INDEXES;

我不知道是否自动创建了“ PARTITION FOR（DATE'2017-01-01'）”，也许您必须运行INSERT INTO ORDERHDR_PART (LASTUPDATE) VALUES (DATE '2017-01-01'); ROLLBACK;才能首先创建它。

所有月份您将获得一个分区，然后可以使用Splitting into Multiple Partitions拆分该分区。应该是这样的：

ALTER TABLE ORDERHDR_PART SPLIT PARTITION FOR (DATE '2017-01-01') INTO ( 
   PARTITION ORDERHDR_PART_JAN VALUES less than (TO_DATE('01-02-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_FEB VALUES less than (TO_DATE('01-03-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_MAR VALUES less than (TO_DATE('01-04-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_APR VALUES less than (TO_DATE('01-05-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_MAY VALUES less than (TO_DATE('01-06-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_JUN VALUES less than (TO_DATE('01-07-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_JUL VALUES less than (TO_DATE('01-08-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_AUG VALUES less than (TO_DATE('01-09-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_SEP VALUES less than (TO_DATE('01-10-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_OCT VALUES less than (TO_DATE('01-11-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_NOV VALUES less than (TO_DATE('01-12-2018','DD-MM-YYYY')),
   PARTITION ORDERHDR_PART_DEC VALUES less than (TO_DATE('01-01-2019','DD-MM-YYYY'))
);

请注意，默认情况下，您无法删除RANGE分区表的初始分区。如果您遇到此问题，请执行：

ALTER TABLE ORDERHDR_PART SET INTERVAL ();
ALTER TABLE ORDERHDR_PART DROP PARTITION ORDERHDR_INITIAL;
ALTER TABLE ORDERHDR_PART SET INTERVAL (NUMTOYMINTERVAL(1, 'MONTH'));

如何在oracle中创建每月分区？

1 个答案: