How to Partition a Non-partitioned Table [ID 1070693.6]
| How to Partition a Non-partitioned Table [ID 1070693.6] |
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Modified 03-MAR-2010 Type BULLETIN Status PUBLISHED |
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PURPOSE
You have a table that is not partitioned that you would like to make into a partitioned table. This article describes four possible methods for partitioning a non-partitioned table.
These steps can also be used to change other partitioning characteristics such as adding subpartitioning to a partitioned table.
SCOPE & APPLICATION
Users needing to partition a non-partitioned table.
RELATED DOCUMENTS
Note:72332.1 DIAGNOSING ORA-14097 ON ALTER TABLE EXCHANGE PARTITION
Note:105317.1 Section "VII.7 Partition exchanges
Note:472449.1 How To Partition Existing Table Using DBMS_Redefinition
You can partition a non-partitioned table in one of four ways:
A) Export/import method
B) Insert with a subquery method
C) Partition exchange method
D) DBMS_REDEFINITION
Either of these four methods will create a partitioned table from an existing non-partitioned table.
A. Export/import method
--------------------
1) Export your table:
exp usr/pswd tables=numbers file=exp.dmp
2) Drop the table:
drop table numbers;
3) Recreate the table with partitions:
create table numbers (qty number(3), name varchar2(15))
partition by range (qty)
(partition p1 values less than (501),
partition p2 values less than (maxvalue));
4) Import the table with ignore=y:
imp usr/pswd file=exp.dmp ignore=y
The ignore=y causes the import to skip the table creation and
continues to load all rows.
B. Insert with a subquery method
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1) Create a partitioned table:
create table partbl (qty number(3), name varchar2(15))
partition by range (qty)
(partition p1 values less than (501),
partition p2 values less than (maxvalue));
2) Insert into the partitioned table with a subquery from the
non-partitioned table:
insert into partbl (qty, name)
select * from origtbl;
3) If you want the partitioned table to have the same name as the
original table, then drop the original table and rename the
new table:
drop table origtbl;
alter table partbl rename to origtbl;
C. Partition Exchange method
-------------------------
ALTER TABLE EXCHANGE PARTITION can be used to convert a partition (or
subpartition) into a non-partitioned table and a non-partitioned table into a
partition (or subpartition) of a partitioned table by exchanging their data
and index segments.
1) Create table dummy_t as select with the required partitions
2) Alter table EXCHANGE partition partition_name
with table non-partition_table;
Example
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SQL> CREATE TABLE p_emp
2 (sal NUMBER(7,2))
3 PARTITION BY RANGE(sal)
4 (partition emp_p1 VALUES LESS THAN (2000),
5 partition emp_p2 VALUES LESS THAN (4000));
Table created.
SQL> SELECT * FROM emp;
EMPNO ENAME JOB MGR HIREDATE SAL
--------- ---------- --------- --------- --------- ---------
7369 SMITH CLERK 7902 17-DEC-80 800
7499 ALLEN SALESMAN 7698 20-FEB-81 1600
7521 WARD SALESMAN 7698 22-FEB-81 1250
7566 JONES MANAGER 7839 02-APR-81 2975
7654 MARTIN SALESMAN 7698 28-SEP-81 1250
7698 BLAKE MANAGER 7839 01-MAY-81 2850
7782 CLARK MANAGER 7839 09-JUN-81 2450
7788 SCOTT ANALYST 7566 19-APR-87 3000
7839 KING PRESIDENT 17-NOV-81 5000
7844 TURNER SALESMAN 7698 08-SEP-81 1500
7876 ADAMS CLERK 7788 23-MAY-87 1100
7900 JAMES CLERK 7698 03-DEC-81 950
7902 FORD ANALYST 7566 03-DEC-81 3000
7934 MILLER CLERK 7782 23-JAN-82 1300
14 rows selected.
SQL> CREATE TABLE dummy_y as SELECT sal
FROM emp WHERE sal<2000;
Table created.
SQL> CREATE TABLE dummy_z as SELECT sal FROM emp WHERE sal
BETWEEN 2000 AND 3999;
Table created.
SQL> alter table p_emp exchange partition emp_p1
with table dummy_y;
Table altered.
SQL> alter table p_emp exchange partition emp_p2
with table dummy_z;
Table altered.
D. DBMS_REDEFINITION
-----------------
See Note 472449.1 "How To Partition Existing Table Using DBMS_Redefinition" for detailed instructions.
在线重定义参考：
http://blog.csdn.net/xujinyang/article/details/6831289
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