oracle分区表和分区表exchange

查询分区表分区内容

select * from emp2 partition(emp2_p3);

1 创建分区表emp1

CREATE TABLE emp1
(empno NUMBER(4) NOT NULL,
ename VARCHAR2(10),
sal NUMBER(7))
PARTITION BY RANGE(ename)
(partition emp2_p1 VALUES LESS THAN ('D'),
partition emp2_p2 VALUES LESS THAN ('Q'),
partition emp2_p3 VALUES LESS THAN (MAXVALUE)
);

2 创建分区表emp2

CREATE TABLE emp2
(empno NUMBER(4) NOT NULL,
ename VARCHAR2(10),
sal NUMBER(7))
PARTITION BY RANGE(ename)
(partition emp2_p1 VALUES LESS THAN ('D'),
partition emp2_p2 VALUES LESS THAN ('Q'),
partition emp2_p3 VALUES LESS THAN (MAXVALUE)
);

3 创建非分区表

create table emp_tmp
(
empno NUMBER(4) NOT NULL,
ename VARCHAR2(10),
sal NUMBER(7)
);

或

create table emp_test  as select * from emp1 where 1=0;(创建emp_test表和emp1表结构一样但没有数据)
create table emp_test  as select * from emp1;(创建emp_test表和emp1一模一样)

4 插入数据

insert into emp2 values(1,'Andy',575);
insert into emp2 values(2,'Derek',570);
insert into emp2 values(3,'Patrick',590);
insert into emp2 values(4,'Richard',400);
insert into emp1 values(5,'Heidi',666);

5 将emp2_p2和emp1_p2通过emp_tmp进行交换

alter table emp2 exchange partition emp2_p2  with table emp_tmp UPDATE GLOBAL INDEXES;
alter table emp1 exchange partition emp2_p2 with table emp_tmp UPDATE GLOBAL INDEXES;
alter table emp2 exchange partition emp2_p2  with table emp_tmp UPDATE GLOBAL INDEXES;