Oracle表分区.doc

Oracle 表分区方法
1 对表进行单列范围分区:
这使最为常用也是最简单方法,具体例子如下:
create table emp
(empno number(4),
ename varchar2(30),
sal number)
partition by range(empno)
(partition e1 values less than (1000) tablespace emp1,
partition e2 values less than (2000) tablespace emp2,
partition e3 values less than (maxvalue) tablespace emp3);
insert into emp values (100,'Tom',1000);
insert into emp values (500,'Peter',2000);
insert into emp values (1000,'Scott',3000);
insert into emp values (1999,'Bill',4000);
insert into emp values (5000,'Gates',6000);
commit; 字串6
从emp表中选择全部纪录如下:
SQL> select * from emp;

EMPNO ENAME SAL
---------- ------------------------------ ----------
100 Tom 1000
500 Peter 2000
1000 Scott 3000
1999 Bill 4000
5000 Gates 6000
还可以按照分区进行选择:
SQL> select * from emp partition (e1);
EMPNO ENAME SAL
---------- ------------------------------ ----------
100 Tom 1000
500 Peter 2000

SQL> select * from emp partition (e2)
EMPNO ENAME SAL
---------- ------------------------------ ----------
1000 Scott 3000
1999 Bill 4000

SQL> select * from emp partition (e3)
EMPNO ENAME SAL
---------- ------------------------------ ----------
5000 Gates 6000
使用了分区,还可以单独针对指定分区进行truncate操作:
alter table emp truncate partition e2;
2 对表进行多列范围分区:
多列范围分区主要是基于表中多个列值范围对数据进行分区,例如:
drop table emp;
create table emp
(empno number(4),