#表的在线重定义
#普通的堆表定义为分区表
#思路-----现有emp1表,需要定义为分区表.需要一个临时分区表emp1_temp.把emp1_temp定义为分区表之后,将emp1 和 emp1_temp进行互换。
#完成emp1定义为分区表
#构造emp1
SYS@PROD>create table scott.emp1 as select * from scott.emp;
Table created.
#建立约束信息,验证定义过程约束是否迁移
SYS@PROD>alter table scott.emp1 add constraint pk_emp1 primary key(empno);
Table altered.
#表的联机重定义要求表是自包含的,所谓自包含就是该表的对象不依赖与其他表空间
#比如表的索引是在该表所在的表空间 a,而不是在表空间b(个人理解)
SYS@PROD>BEGIN
2 DBMS_REDEFINITION.CAN_REDEF_TABLE('scott','emp1');
3 END;
4 /
PL/SQL procedure successfully completed.
SYS@PROD>
#建立临时分区表emp1_temp
SYS@PROD>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.
#启动表的联机重定义
SYS@PROD>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
SYS@PROD>select count(*) from scott.emp1_temp;
COUNT(*)
----------
14
#查看临时分区表数据
SYS@PROD> 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
SYS@PROD>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
#将索引 约束信息迁移到临时分区表
SYS@PROD>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 互换
SYS@PROD> EXECUTE dbms_redefinition.finish_redef_table('scott','emp1','emp1_temp');
PL/SQL procedure successfully completed.
#查看结果
SCOTT@PROD>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
SCOTT@PROD>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.
SCOTT@PROD>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动手实验 Oracle 在线重定义普通表为分区表
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转载自blog.csdn.net/lv941002/article/details/82913655
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