Oracle数据库表范围分区策略测试过程

   来源：赛迪网技术社区    作者：dblearn

/*该试验针对按照递增列作为分区条件的情况，按照时间作为分区条件的等下次测试*/

create tablespace test01 datafile 'D:\oracle\oradata\myora\test01.dbf'size 50m;
create tablespace test02 datafile 'D:\oracle\oradata\myora\test02.dbf'size 50m;
create tablespace test03 datafile 'D:\oracle\oradata\myora\test03.dbf'size 50m;

create tablespace test_idx01 datafile 'D:\oracle\oradata\myora\test_idx01.dbf'size 20m;
create tablespace test_idx02 datafile 'D:\oracle\oradata\myora\test_idx02.dbf'size 20m;
create tablespace test_idx03 datafile 'D:\oracle\oradata\myora\test_idx03.dbf'size 20m;

Create table test (
  aa integer,
  bb varchar2(100)
)
partition by rang(aa)(
Partition part_01 values less than(10000) Tablespace test_idx01,
Partition part_02 values less than(30000) Tablespace test_idx02,
Partition part_03 values less than(maxvalue)Tablespace test_idx03
);

Create Index idx_test_aa On test(aa)Local
(
Partition part_01 Tablespace test_idx01,
Partition part_02 Tablespace test_idx02,
Partition part_03 Tablespace test_idx03
); 

-- Create sequence 
create sequence seq_test_aa
minvalue 1
maxvalue 60000
start with 1
increment by 1
cache 10;

insert into test values(seq_test_aa.nextval,'test');

select Min(callid),Max(callid),Count(*) from test partition(part_01);
select Min(callid),Max(callid),Count(*) from test partition(part_02);
select Min(callid),Max(callid),Count(*) from test partition(part_03);
select Min(callid),Max(callid),Count(*) from test Where callid < 10000;
select Min(callid),Max(callid),Count(*) from test Where callid > 10000 And callid < 30000;
select Min(callid),Max(callid),Count(*) from test Where callid >= 30000;

exp test/test@myora file=e:\test01.dmp buffer=8192000 tables=test:part_01 rows=Y 
exp test/test@myora file=e:\test02.dmp buffer=8192000 tables=test:part_02 rows=Y 
exp test/test@myora file=e:\test03.dmp buffer=8192000 tables=test:part_03 rows=Y 

/*注意：这里删除的分区要从后面删，因为oracle不允许向前添加分区，只能向后添加分区*/
alter table cdr drop partition part03 ;

select Min(aa),Max(aa),Count(*) from test partition(part_01);
select Min(aa),Max(aa),Count(*) from test partition(part_02);
select Min(aa),Max(aa),Count(*) from test partition(part_03);   --本条将报错，提示无此分区
select Min(aa),Max(aa),Count(*) from test Where aa < 3000000;
select Min(aa),Max(aa),Count(*) from test Where aa > 3000000 And aa < 6000000;
select Min(aa),Max(aa),Count(*) from test Where aa >= 6000000;  --将无数据显示

alter table test add partition part03 values less than(maxvalue) tablespace test03;

select Min(aa),Max(aa),Count(*) from test partition(part_01);
select Min(aa),Max(aa),Count(*) from test partition(part_02);
select Min(aa),Max(aa),Count(*) from test partition(part_03);  --将无数据
select Min(aa),Max(aa),Count(*) from test Where aa < 3000000;
select Min(aa),Max(aa),Count(*) from test Where aa > 3000000 And aa < 6000000;
select Min(aa),Max(aa),Count(*) from test Where aa >= 6000000;   --将无数据显示

imp test/test@myora FILE=e:\test03.dmp TABLES = (cdr:part_03) IGNORE=y

select Min(aa),Max(aa),Count(*) from test partition(part_01);
select Min(aa),Max(aa),Count(*) from test partition(part_02);
select Min(aa),Max(aa),Count(*) from test partition(part_03);  
select Min(aa),Max(aa),Count(*) from test Where aa < 3000000;
select Min(aa),Max(aa),Count(*) from test Where aa > 3000000 And aa < 6000000;
select Min(aa),Max(aa),Count(*) from test Where aa >= 6000000;   

delete from test partition(part_02);
commit;

select Min(aa),Max(aa),Count(*) from test partition(part_01);
select Min(aa),Max(aa),Count(*) from test partition(part_02);  --将无数据显示
select Min(aa),Max(aa),Count(*) from test partition(part_03);
select Min(aa),Max(aa),Count(*) from test Where aa < 3000000;
select Min(aa),Max(aa),Count(*) from test Where aa > 3000000 And aa < 6000000;  --将无数据显示
select Min(aa),Max(aa),Count(*) from test Where aa >= 6000000;

insert into test values(40000,'test');
commit;

select Min(aa),Max(aa),Count(*) from test partition(part_01);
select Min(aa),Max(aa),Count(*) from test partition(part_02);  --将显示1条数据
select Min(aa),Max(aa),Count(*) from test partition(part_03);
select Min(aa),Max(aa),Count(*) from test Where aa < 3000000;
select Min(aa),Max(aa),Count(*) from test Where aa > 3000000 And aa < 6000000;  --将显示1条数据
select Min(aa),Max(aa),Count(*) from test Where aa >= 6000000;

select count(*) from test where aa > 1000001; --将有大量数据统计出
select count(*) from test partition(part_02) where aa > 1000001; --结果为0条

alter table cdr split partition part_02  at (50000) into(partition part_02,partition part_06 tablespace test01p2);

通过这个测试，创建好的分区可以直接使用分区拆分功能对现有的分区进行分割，分割时可以指定表空间。因此，在这里建议以后创建分区的命名和表空间的命名时可以从第二位或者第三位开始命名：如part_01,part_02,part_03.....，这样可以为以后的分区拆分留下扩展空间（可以按照PB中的DataWindow的思想做）。