#表的線上重定義
#普通的堆表定義為分割槽表
#思路-----現有emp1表,需要定義為分割槽表.需要一個臨時分割槽表emp1_temp.把emp1_temp定義為分割槽表之後,將emp1 和 emp1_temp進行互換。
#完成emp1定義為分割槽表

#構造emp1
[email protected]>create table scott.emp1 as select * from scott.emp;

Table created.

#建立約束資訊,驗證定義過程約束是否遷移
[email protected]>alter table scott.emp1 add constraint pk_emp1 primary key(empno);

Table altered.

#表的聯機重定義要求表是自包含的,所謂自包含就是該表的物件不依賴與其他表空間
#比如表的索引是在該表所在的表空間 a,而不是在表空間b(個人理解)
 
[email protected]>BEGIN
  2    DBMS_REDEFINITION.CAN_REDEF_TABLE('scott','emp1');
  3  END;
  4  /

PL/SQL procedure successfully completed.

[email protected]>



#建立臨時分割槽表emp1_temp
[email protected]>CREATE TABLE scott.emp1_temp
  2    (empno        number(4) not null,
  3     ename        varchar2(10),
  4     job          varchar2(9),
  5     mgr          number(4),
  6     hiredate     date,
  7     sal          number(7,2),
  8     deptno       number(2))
  9      PARTITION BY RANGE(sal)
 10     (PARTITION sal_low VALUES LESS THAN(2500),
 11     PARTITION sal_high VALUES LESS THAN (maxvalue));

Table created.



#啟動表的聯機重定義
 
[email protected]>BEGIN
  2    dbms_redefinition.start_redef_table('scott','emp1','emp1_temp',
  3     'empno empno,
  4     ename ename,
  5     job job,
  6     mgr mgr,
  7     hiredate hiredate,
  8     sal sal,
  9     deptno deptno');
 10  END;
 11  /

PL/SQL procedure successfully completed



 
[email protected]>select count(*) from scott.emp1_temp;

  COUNT(*)
----------
        14

#檢視臨時分割槽表資料        
[email protected]> select * from scott.emp1_temp partition(sal_low);

     EMPNO ENAME      JOB              MGR HIREDATE            SAL     DEPTNO
---------- ---------- --------- ---------- ------------ ---------- ----------
      7369 SMITH      CLERK           7902 17-DEC-80           800         20
      7499 ALLEN      SALESMAN        7698 20-FEB-81          1600         30
      7521 WARD       SALESMAN        7698 22-FEB-81          1250         30
      7654 MARTIN     SALESMAN        7698 28-SEP-81          1250         30
      7782 CLARK      MANAGER         7839 09-JUN-81          2450         10
      7844 TURNER     SALESMAN        7698 08-SEP-81          1500         30
      7876 ADAMS      CLERK           7788 23-MAY-87          1100         20
      7900 JAMES      CLERK           7698 03-DEC-81           950         30
      7934 MILLER     CLERK           7782 23-JAN-82          1300         10
      

[email protected]>select * from scott.emp1_temp partition(sal_high);

     EMPNO ENAME      JOB              MGR HIREDATE            SAL     DEPTNO
---------- ---------- --------- ---------- ------------ ---------- ----------
      7566 JONES      MANAGER         7839 02-APR-81          2975         20
      7698 BLAKE      MANAGER         7839 01-MAY-81          2850         30
      7788 SCOTT      ANALYST         7566 19-APR-87          3000         20
      7839 KING       PRESIDENT            17-NOV-81          5000         10
      7902 FORD       ANALYST         7566 03-DEC-81          3000         20
      
      
      
#將索引 約束資訊遷移到臨時分割槽表
[email protected]>DECLARE
  2    log_error int;
  3  BEGIN
  4    DBMS_REDEFINITION.COPY_TABLE_DEPENDENTS(
  5  uname   =>'SCOTT',
  6  orig_table  =>'EMP1',
  7  int_table  =>'EMP1_TEMP',
  8  num_errors =>log_error
  9  );
 10  END;
 11  /

PL/SQL procedure successfully completed



#emp1 和 emp1_temp 互換
[email protected]> EXECUTE dbms_redefinition.finish_redef_table('scott','emp1','emp1_temp');

PL/SQL procedure successfully completed.



#檢視結果
[email protected]>select table_name,partition_name,high_value from user_tab_partitions where table_name='EMP1';

TABLE_NAME                     PARTITION_NAME                 HIGH_VALUE
------------------------------ ------------------------------ ----------
EMP1                           SAL_HIGH                       MAXVALUE
EMP1                           SAL_LOW                        2500



[email protected]>select * from emp1 partition(sal_low);

     EMPNO ENAME      JOB              MGR HIREDATE            SAL     DEPTNO
---------- ---------- --------- ---------- ------------ ---------- ----------
      7369 SMITH      CLERK           7902 17-DEC-80           800         20
      7499 ALLEN      SALESMAN        7698 20-FEB-81          1600         30
      7521 WARD       SALESMAN        7698 22-FEB-81          1250         30
      7654 MARTIN     SALESMAN        7698 28-SEP-81          1250         30
      7782 CLARK      MANAGER         7839 09-JUN-81          2450         10
      7844 TURNER     SALESMAN        7698 08-SEP-81          1500         30
      7876 ADAMS      CLERK           7788 23-MAY-87          1100         20
      7900 JAMES      CLERK           7698 03-DEC-81           950         30
      7934 MILLER     CLERK           7782 23-JAN-82          1300         10

9 rows selected.


[email protected]>select * from emp1 partition(sal_high);

     EMPNO ENAME      JOB              MGR HIREDATE            SAL     DEPTNO
---------- ---------- --------- ---------- ------------ ---------- ----------
      7566 JONES      MANAGER         7839 02-APR-81          2975         20
      7698 BLAKE      MANAGER         7839 01-MAY-81          2850         30
      7788 SCOTT      ANALYST         7566 19-APR-87          3000         20
      7839 KING       PRESIDENT            17-NOV-81          5000         10
      7902 FORD       ANALYST         7566 03-DEC-81          3000         20