关于range partition 用到多列的一个小案例
作者:刘颖博
时间:2003-12-29
mail:[email protected],请指正
转载请注明出处及作者
1.实践
首先建分区表
create table simng_part (
latn_id number(4) not null,
pname char(200),
mon_id number(2) not null
)
partition by range(latn_id,mon_id)
(
partition part_a01 values less than (2000, 2) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_a02 values less than (2000, 3) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_a12 values less than (2000,13) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b01 values less than (2003, 2) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b02 values less than (2003, 3) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b12 values less than (2003,13) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_d12 values less than (2020,13) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000)
)
/
insert into simng_part values(2000,'a',1);
insert into simng_part values(2000,'a',2);
insert into simng_part values(2000,'a',3);
insert into simng_part values(2002,'a',1);
insert into simng_part values(2002,'a',3);
insert into simng_part values(2002,'a',9);
insert into simng_part values(2019,'a',1);
commit;
create table simng_part1 (
latn_id number(4) not null,
pname char(200),
mon_id number(2) not null
)
partition by range(mon_id,latn_id)
(
partition part_a01 values less than ( 2,2000) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b01 values less than ( 2,2003) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_a02 values less than ( 3,2000) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b02 values less than ( 3,2003) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_a12 values less than (13,2000) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b12 values less than (13,2003) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_d12 values less than (13,2020) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000)
)
/
insert into simng_part1 values(2000,'a',1);
insert into simng_part1 values(2000,'a',2);
insert into simng_part1 values(2000,'a',3);
insert into simng_part1 values(2002,'a',1);
insert into simng_part1 values(2002,'a',3);
insert into simng_part1 values(2002,'a',9);
insert into simng_part1 values(2019,'a',1);
commit;
2.问题
先思考两个问题:
试问表simng_part :part_b01分区中有几条记录。
试问表simng_part1 :part_a01分区中有几条记录。
答案是:
latn_id name mon_id
第一个
2002 a 3
2002 a 1
2002 a 9
第二个
2000 a 1
2002 a 1
2019 a 1
查询如下:
sql> select * from simng_part partition(part_b01);
latn_id pname mon_id
------- ------------- ----------------
2002 a 1
2002 a 3
2002 a 9
sql> select * from simng_part1 partition(part_a01);
latn_id pname mon_id
------- ------------- ----------------
2000 a 1
2002 a 1
2019 a 1
3.结论
关于range partition分区,
首先注意的是,分区不包含上限
同时
对于存在多个列来进行range partition
遵循这个原则:
只要满足第n列条件,就放在这个分区,而不管第n+1列是否满足!
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感谢 [email protected]花城