1、分割槽表建立

--範圍分割槽示例
drop table range_part_tab purge;
--注意，此分割槽為範圍分割槽
create table range_part_tab (id number,deal_date date,area_code number,contents varchar2(4000))
           partition by range (deal_date)
           (
           partition p1 values less than (TO_DATE('2012-02-01', 'YYYY-MM-DD')),
           partition p2 values less than (TO_DATE('2012-03-01', 'YYYY-MM-DD')),
           partition p3 values less than (TO_DATE('2012-04-01', 'YYYY-MM-DD')),
           partition p4 values less than (TO_DATE('2012-05-01', 'YYYY-MM-DD')),
           partition p5 values less than (TO_DATE('2012-06-01', 'YYYY-MM-DD')),
           partition p6 values less than (TO_DATE('2012-07-01', 'YYYY-MM-DD')),
           partition p7 values less than (TO_DATE('2012-08-01', 'YYYY-MM-DD')),
           partition p8 values less than (TO_DATE('2012-09-01', 'YYYY-MM-DD')),
           partition p9 values less than (TO_DATE('2012-10-01', 'YYYY-MM-DD')),
           partition p10 values less than (TO_DATE('2012-11-01', 'YYYY-MM-DD')),
           partition p11 values less than (TO_DATE('2012-12-01', 'YYYY-MM-DD')),
           partition p12 values less than (TO_DATE('2013-01-01', 'YYYY-MM-DD')),
           partition p_max values less than (maxvalue)
           );
 

插入資料：

--以下是插入2012年一整年日期隨機數和表示福建地區號含義（591到599）的隨機數記錄，共有10萬條，如下：

insert into range_part_tab (id,deal_date,area_code,contents)
      select rownum,
             to_date( to_char(sysdate-365,'J')+TRUNC(DBMS_RANDOM.VALUE(0,365)),'J'),
             ceil(dbms_random.value(590,599)),
             rpad('*',400,'*')
        from dual
      connect by rownum <= 100000;
commit;
 

2、

--分割槽原理分析之普通表插入
drop table norm_tab purge;
create table norm_tab (id number,deal_date date,area_code number,contents varchar2(4000));
insert into norm_tab(id,deal_date,area_code,contents)
      select rownum,
             to_date( to_char(sysdate-365,'J')+TRUNC(DBMS_RANDOM.VALUE(0,365)),'J'),
             ceil(dbms_random.value(590,599)),
             rpad('*',400,'*')
        from dual
      connect by rownum <= 100000;
commit;




--分割槽清除的方便例子
delete from norm_tab where deal_date>=TO_DATE('2012-09-01', 'YYYY-MM-DD')  and deal_date <= TO_DATE('2012-09-30', 'YYYY-MM-DD');
--為了後續章節試驗的方便，本處暫且將刪除的記錄回退。
rollback;
select * from range_part_tab partition(p9);
alter table range_part_tab truncate partition p9;

set linesize 1000
set autotrace on 

select count(*) from normal_tab where deal_date>=TO_DATE('2012-09-01', 'YYYY-MM-DD')  and deal_date <= TO_DATE('2012-09-30', 'YYYY-MM-DD');

select count(*) from range_part_tab where deal_date>=TO_DATE('2012-09-01', 'YYYY-MM-DD')  and deal_date <= TO_DATE('2012-09-30', 'YYYY-MM-DD');

 

3、分割槽交換的神奇例子

drop table mid_table purge;
create table mid_table (id number ,deal_date date,area_code number,contents varchar2(4000));
select count(*) from range_part_tab partition(p8);

---當然，除了上述用partition(p8)的指定分割槽名查詢外，也可以採用分割槽條件代入查詢：
select count(*) from range_part_tab where deal_date>=TO_DATE('2012-08-01', 'YYYY-MM-DD')  and deal_date <= TO_DATE('2012-08-31', 'YYYY-MM-DD');

--以下命令就是經典的分割槽交換：
alter table range_part_tab exchange partition p8 with table mid_table;

--查詢發現分割槽8資料不見了。
select count(*) from range_part_tab partition(p8);

---而普通表記錄由剛才的0條變為8628條了，果然實現了交換。
select count(*) from mid_table ;