oracle11g分割槽表

1按需建立分割槽，可以自動擴充套件分割槽

create table f_sales(sales_amt number,d_date date)partition by range (d_date) interval(numtoyminterval(1,'year')) (partition p1 values less than(to_date('01-jan-2010','dd-mon-yyyy')));

2通過partition by reference子句來指定子表與父表同樣的方式進行分割槽

create table orders( order_id number,order_date date,constraint order_pk primary key(order_id))partition by range(order_date)(partition p10 values less than(to_date('01-jan-2010','dd-mon-yyyy')));

create tale order_items(line_id number,order_id number not null,constraint order_items_pk primary key(line_id,order_id),constraint order_items_fk1 foreign key(order_id) references orders) partition by reference(order_items_fk1);

3基於虛擬列的分割槽

create table emp(emp_id numbser,salary number,comm_pct number,commission generated always as (salary*comm_pct))partition by range(commission)(

partition p1 values less than (1000),partition p2 values less than(2000),partition p3 valeus less than (maxvalue));

4自定義插入到哪個分割槽，系統分割槽

create table test (id int ,name varchar2(100)) partition by system(partition p1,partition p2,partition p3);

insert into test partition(p1) values(1,'test'):

5更改分割槽鍵，讓記錄能更換分割槽，而不是報錯

alter table test enable row movement;

6交換分割槽，把乙個表變成乙個分割槽，或將乙個分割槽變成乙個表（實驗）

create table f_sales(sales_amt number, d_date_id number)

partition by range(d_date_id)

(partition p_2007 values less than(20080101),

partition p_2008 values less than (20090101),

partition p_2009 values less than (20100101));

create bitmap index d_date_id_fk1 on f_sales(d_date_id) local;

alter table f_sales add partition p_2010 values less than(20110101);

create table workpart(sales_amt number,d_date_id number);

insert into workpart values(100,20100101);

insert into workpart values(200,20100102);

create bitmap index d_date_id_fk2 on workpart(d_date_id);

alter table f_sales exchange partition p_2010 with table workpart including indexes without validation;

select * from workpart;

select * from f_sales partition(p_2010);

select index_name,partition_name,status from user_ind_partitions where index_name like 'd_date%';

7拆分分割槽

alter table f_sales split partition p_2010 at (20100601) into (partition p2010_a,partition p2010) update indexes;

select * from user_part_tables a where a.table_name='f_sales';

select * from user_tab_partitions a where a.table_name='f_sales';

insert into f_sales values(300,20100401);

insert into f_sales values(400,20101001);

select * from f_sales partition(p2010_a);

select * from f_sales partition(p2010);

上面的拆分的範圍分割槽

下面的是拆分的列表分割槽

alter table f_sales split partition reg_mid values('ia','ks','mi','mn') into (partition reg_mid_a,partition reg_mid_b);

8合併分割槽

alter table f_sales merge partitions p2010_a,p2010 into partition pp2010;

select * from user_tab_partitions a where a.table_name='f_sales';

在合併的時候分割槽的名稱是可以指定的

select index_name,partition_name,status from user_ind_partitions where index_name like 'd_date%';

1d_date_id_fk1pp2010unusable

2d_date_id_fk1p_2007usable

3d_date_id_fk1p_2008usable

4d_date_id_fk1p_2009usable

合併後的分割槽，本地索引是失效了的，使用下面的語句重建本地索引

alter table f_sales modify partition pp2010 rebuild unusable local indexes;

9刪除分割槽

alter table f_sales drop partition pp2010;

10刪除乙個分割槽中的記錄

alter table f_sales truncate partition p_2008;

delete from f_sales partition(p_2008);

11建立本地索引，本地索引分割槽索引的分割槽與表的分割槽不在一起

create index i_f_sales on f_sales(d_date_id) local(partition p2009 tablespace idx1,partition p2010 tablespace idx2);

本地分割槽索引分有字首的本地分割槽索引和無字首的區域性索引，有字首的區域性分割槽索引就是索引最左側的列是分割槽列，無字首索引就是最左側的列不是分割槽列

可以檢視

select index_name,table_name,alignment,locality from user_part_indexs;檢視索引是否是字首索引

12建立全域性索引

我們在乙個不是分割槽鍵的字段查詢分割槽表，想要在這個欄位上建立乙個索引來提高效能，建立全域性索引，全域性索引有雜湊分割槽或範圍全域性索引，

create index f_sales on f_sales(sales_id) global partition by range(sales_id) (partition pg1 values less than （100），partition pg2 values less than (200),partition pg3 values less than (maxvalue));

create index f_sales_idx on f_sales(count) global partition by hash(count) partitions 3;

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