exchange partition的一些测试
在线重定义表可以将一个普通表转换成一个分区表。
exchange partition可以将一个分区表的一个分区和另一张表的数据互换,
也可以从普通表表迁移至分区表.
它通过更新数据字典来实现分区表与普通表的转换，所以速度非常快
SQL> create table LGX_PARTAB(
2 A INT,
3 B DATE)
4 PARTITION BY RANGE(A)(
5 PARTITION PART01 VALUES LESS THAN(10),
6 PARTITION PART02 VALUES LESS THAN(20),
7 PARTITION PART03 VALUES LESS THAN(MAXVALUE));
Table created.
SQL> INSERT INTO LGX_PARTAB VALUES(1,SYSDATE);
1 row created.
SQL> INSERT INTO LGX_PARTAB VALUES(11,SYSDATE);
1 row created.
SQL> SELECT * FROM LGX_PARTAB PARTITION (PART01);
A B
---------- -------------------
1 2015/09/28 09:35:32
SQL> SELECT * FROM LGX_PARTAB PARTITION (PART02);
A B
---------- -------------------
11 2015/09/28 09:35:39
SQL> CREATE TABLE LGX_TAB01(
2 A INT,
3 B DATE);
Table created.
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01;
Table altered.
SQL> select * from lgx_tab01;
A B
---------- -------------------
11 2015/09/28 09:35:39
SQL> SELECT * FROM LGX_PARTAB PARTITION (PART02);
no rows selected
SQL> INSERT INTO LGX_TAB01 VALUES(12,SYSDATE);
1 row created.
SQL> commit;
Commit complete.
SQL> SELECT * FROM LGX_TAB01;
A B
---------- -------------------
11 2015/09/28 09:35:39
12 2015/09/28 09:37:50
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01;
Table altered.
SQL> SELECT * FROM LGX_TAB01;
no rows selected
SQL> SELECT * FROM LGX_PARTAB PARTITION (PART02);
A B
---------- -------------------
11 2015/09/28 09:35:39
12 2015/09/28 09:37:50
SQL> INSERT INTO LGX_TAB01 VALUES(30,SYSDATE);
1 row created.
SQL> commit;
Commit complete.
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01;
WITH TABLE LGX_TAB01
*
ERROR at line 2:
ORA-14099: all rows in table do not qualify for specified partition
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01 WITHOUT VALIDATION;
Table altered.
SQL> SELECT * FROM LGX_PARTAB PARTITION (PART02);
A B
---------- -------------------
30 2015/09/28 09:39:46
SQL> SELECT * FROM LGX_TAB01;
A B
---------- -------------------
11 2015/09/28 09:35:39
12 2015/09/28 09:37:50
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01 WITH VALIDATION;
Table altered.
SQL> SELECT * FROM LGX_TAB01;
A B
---------- -------------------
30 2015/09/28 09:39:46
SQL> SELECT * FROM LGX_PARTAB PARTITION (PART02);
A B
---------- -------------------
11 2015/09/28 09:35:39
12 2015/09/28 09:37:50
SQL> DESC LGX_TAB01;
Name Null? Type
----------------------------------------- -------- ----------------------------
A NUMBER(38)
B DATE
SQL> DESC LGX_PARTAB;
Name Null? Type
----------------------------------------- -------- ----------------------------
A NUMBER(38)
B DATE
SQL> alter table lgx_partab rename column b to c;
Table altered.
SQL> DESC LGX_PARTAB;
Name Null? Type
----------------------------------------- -------- ----------------------------
A NUMBER(38)
C DATE
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01;
WITH TABLE LGX_TAB01
*
ERROR at line 2:
ORA-14099: all rows in table do not qualify for specified partition
SQL> delete from lgx_tab01;
1 row deleted.
SQL> commit;
Commit complete.
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01;
Table altered.
SQL> SELECT * FROM LGX_TAB01;
A B
---------- -------------------
11 2015/09/28 09:35:39
12 2015/09/28 09:37:50
SQL> SELECT * FROM LGX_PARTAB PARTITION (PART02);
no rows selected
SQL> DESC LGX_TAB01;
Name Null? Type
----------------------------------------- -------- ----------------------------
A NUMBER(38)
B DATE
SQL> DESC LGX_PARTAB;
Name Null? Type
----------------------------------------- -------- ----------------------------
A NUMBER(38)
C DATE
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01;
Table altered.
SQL> SELECT * FROM LGX_PARTAB PARTITION (PART02);
A C
---------- -------------------
11 2015/09/28 09:35:39
12 2015/09/28 09:37:50
SQL> SELECT * FROM LGX_TAB01;
no rows selected
SQL> ALTER TABLE LGX_TAB01 MODIFY (B VARCHAR2(30));
Table altered.
SQL> desc lgx_tab01;
Name Null? Type
----------------------------------------- -------- ----------------------------
A NUMBER(38)
B VARCHAR2(30)
SQL> select * from lgx_tab01;
no rows selected
SQL> desc lgx_partab;
Name Null? Type
----------------------------------------- -------- ----------------------------
A NUMBER(38)
C DATE
SQL> SELECT * FROM LGX_PARTAB PARTITION (PART02);
A C
---------- -------------------
11 2015/09/28 09:35:39
12 2015/09/28 09:37:50
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01;
ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
*
ERROR at line 1:
ORA-14097: column type or size mismatch in ALTER TABLE EXCHANGE PARTITION
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01 WITH VALIDATION;
ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
*
ERROR at line 1:
ORA-14097: column type or size mismatch in ALTER TABLE EXCHANGE PARTITION
SQL> ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
2 WITH TABLE LGX_TAB01 WITHOUT VALIDATION;
ALTER TABLE LGX_PARTAB EXCHANGE PARTITION PART02
*
ERROR at line 1:
ORA-14097: column type or size mismatch in ALTER TABLE EXCHANGE PARTITION
SQL>
注意：
$涉及交换的两表之间表结构必须一致，这里的结构一致主要是指字段数目必须相同而且数据类型必须相同，字段的名字可以不同，如果
数据类型不同，即使加上without validation也没有用，without validation的功能主要是用来验证数据的。
$如果是从非分区表向分区表做交换，非分区表中的数据必须符合分区表中指定分区的规则，除非附加without validation子句;
$如果从分区表向分区表做交换，被交换的分区的数据必须符合分区规则，除非附加without validation子句;
$Global索引或涉及到数据改动了的global索引分区会被置为unusable，除非附加update indexes子句。
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