Try to convert the partitioned Table of interval in the range... Swap partition...
Requirement:Interval of replacement partitioned Table by range partitioned Table
DROP TABLE A;
CREATE TABLE A
(
a NUMBER,
CreationDate DATE
)
PARTITION BY RANGE (CreationDate)
INTERVAL ( NUMTODSINTERVAL (30, 'DAY') )
(PARTITION P_FIRST
VALUES LESS THAN (TIMESTAMP ' 2001-01-01 00:00:00'));
INSERT INTO A
VALUES (1, SYSDATE);
INSERT INTO A
VALUES (1, SYSDATE - 30);
INSERT INTO A
VALUES (1, SYSDATE - 60);
I need to change this partitioned Table apart to a partitioned range Table. I can do using the EXCHANGE PARTITION. Like if I use the classic method to create another table range partitioned, then:DROP TABLE A_Range
CREATE TABLE A_Range
(
a NUMBER,
CreationDate DATE
)
PARTITION BY RANGE (CreationDate)
(partition MAX values less than (MAXVALUE));
Insert /*+ append */ into A_Range Select * from A; --This Step takes very very long..Trying to cut it short using Exchange Partition.
Problems:I can't do
ALTER TABLE A_Range
EXCHANGE PARTITION MAX
WITH TABLE A
WITHOUT VALIDATION;
ORA-14095: ALTER TABLE CHANGE requires a not partitioned table nonclusteredThis is because the tables are partitioned. So it does not allow me.
If I instead:
Create a table that is not partitioned for exchanging data by partition.
Create Table A_Temp as Select * from A;
ALTER TABLE A_Range
EXCHANGE PARTITION MAX
WITH TABLE A_TEMP
WITHOUT VALIDATION;
select count(*) from A_Range partition(MAX);
-The problem is that all the data is in MAX Partition.Even after the creation of a large number of partitions by walls of separation, the data is still in MAX Partition only.
So:
-What we cannot replace a partitioned Table to the Table partitioned using the EXCHANGE PARTITION range interval. that is, we have to insert in...
-We can do it, but I'm missing something here.
-If all the data is in MAX Partition due to "WITHOUT VALIDATION", can say us be redistributed in the right type of range partitions.
You must pre-create the partitions in a_range and then swap one for one for a tmp, and then to arange. With the help of your sample (thanks to proviing code, incidentally).
SQL> CREATE TABLE A
2 (
3 a NUMBER,
4 CreationDate DATE
5 )
6 PARTITION BY RANGE (CreationDate)
7 INTERVAL ( NUMTODSINTERVAL (30, 'DAY') )
8 (PARTITION P_FIRST
9 VALUES LESS THAN (TIMESTAMP ' 2001-01-01 00:00:00'));
Table created.
SQL> INSERT INTO A VALUES (1, SYSDATE);
1 row created.
SQL> INSERT INTO A VALUES (1, SYSDATE - 30);
1 row created.
SQL> INSERT INTO A VALUES (1, SYSDATE - 60);
1 row created.
SQL> commit;
Commit complete.
You can find the form of existing partitions assistance:
SQL> select table_name, partition_name, high_value
2 from user_tab_partitions
3 where table_name = 'A';
TABLE_NAME PARTITION_NAME HIGH_VALUE
---------- -------------- --------------------------------------------------------------------------------
A P_FIRST TO_DATE(' 2001-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA
A SYS_P44 TO_DATE(' 2013-01-28 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA
A SYS_P45 TO_DATE(' 2012-12-29 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA
A SYS_P46 TO_DATE(' 2012-11-29 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA
You can then create the table a_range with apporopriate partitions. Note that you may need to create additional in a_range partitions because the partitioning interval does not create the partitions has no data for, even if that leaves 'holes' in the partitioning scheme. So, on that basis:
SQL> CREATE TABLE A_Range (
2 a NUMBER,
3 CreationDate DATE)
4 PARTITION BY RANGE (CreationDate)
5 (partition Nov_2012 values less than (to_date('30-nov-2012', 'dd-mon-yyyy')),
6 partition Dec_2012 values less than (to_date('31-dec-2012', 'dd-mon-yyyy')),
7 partition Jan_2013 values less than (to_date('31-jan-2013', 'dd-mon-yyyy')),
8 partition MAX values less than (MAXVALUE));
Table created.
Now, create a regular table to use in the constituencies:
SQL> CREATE TABLE A_tmp (
2 a NUMBER,
3 CreationDate DATE);
Table created.
and all partitions in Exchange:
SQL> ALTER TABLE A
2 EXCHANGE PARTITION sys_p44
3 WITH TABLE A_tmp;
Table altered.
SQL> ALTER TABLE A_Range
2 EXCHANGE PARTITION jan_2013
3 WITH TABLE A_tmp;
Table altered.
SQL> ALTER TABLE A
2 EXCHANGE PARTITION sys_p45
3 WITH TABLE A_tmp;
Table altered.
SQL> ALTER TABLE A_Range
2 EXCHANGE PARTITION dec_2012
3 WITH TABLE A_tmp;
Table altered.
SQL> ALTER TABLE A
2 EXCHANGE PARTITION sys_p46
3 WITH TABLE A_tmp;
Table altered.
SQL> ALTER TABLE A_Range
2 EXCHANGE PARTITION nov_2012
3 WITH TABLE A_tmp;
Table altered.
SQL> select * from a;
no rows selected
SQL> select * from a_range;
A CREATIOND
---------- ---------
1 23-NOV-12
1 23-DEC-12
1 22-JAN-13
John
Tags: Database
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