A table of partitioning, as every hour

Hello

I want to create a table and this table has a 24 (fixed) partitions for data every hour. If the partition column (date type) key is equal to '2009-01-17 01:05:09 ', it must be written second partition. If key of partition column equals '2009-01-17 00:05:08 ', it must be written first partition, even if the partition key is equal to "2009-01-24 00:35:47"it must be written to new first partition. How can I create this partitioned table? If we have a chance to write the substr function in the partition key, I could handle by using the partitioning of the list, but there is no chance to write a function in the column name partitoin except the to_date function key. Can you give me an idea or an example?

I use Oracle 11.1.0.7.

Thank you.

Hoek wrote:
Hello

(Given that you're on 11g and I'm not, I can't give some info tested)

Before 11g, it was not possible to partition by a function.
http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:1612281449571 #378322100346018401

But maybe you could try also:

not tested
create table t( dt date )
partition by list (to_char(dt, 'hh24'))
(
partition h01 values ('1'),
partition h02 values ('2'),
partition h03 values ('3'),
partition h04 values ('4'),
partition h05 values ('5'),
--etc...
)
/  

I don't think that this is possible even in 11g. But you're heading in the right direction. Tom probably meant was partitioning by virtual columns that both have have been introduced in 11 g (virtual columns and partitioning by virtual columns).

Something like this maybe:

drop table test_part_virtual_column purge;

create table test_part_virtual_column
(
col1 date not null,
col2 varchar2(20),
col3 as (to_char(col1, 'HH24'))
)
partition by list (col3)
(
partition p_00 values ('00'),
partition p_01 values ('01'),
partition p_02 values ('02'),
partition p_03 values ('03'),
partition p_04 values ('04'),
partition p_05 values ('05'),
partition p_06 values ('06'),
partition p_07 values ('07'),
partition p_08 values ('08'),
partition p_09 values ('09'),
partition p_10 values ('10'),
partition p_11 values ('11'),
partition p_12 values ('12'),
partition p_13 values ('13'),
partition p_14 values ('14'),
partition p_15 values ('15'),
partition p_16 values ('16'),
partition p_17 values ('17'),
partition p_18 values ('18'),
partition p_19 values ('19'),
partition p_20 values ('20'),
partition p_21 values ('21'),
partition p_22 values ('22'),
partition p_23 values ('23')
);

insert into test_part_virtual_column (col1, col2) values (to_date('17/01/2009 01:05:09', 'DD/MM/YYYY HH24:MI:SS'), '1');

insert into test_part_virtual_column (col1, col2) values (to_date('17/01/2009 00:05:08', 'DD/MM/YYYY HH24:MI:SS'), '2');

insert into test_part_virtual_column (col1, col2) values (to_date('24/01/2009 00:35:47', 'DD/MM/YYYY HH24:MI:SS'), '3');

commit;

exec dbms_stats.gather_table_stats(null, 'test_part_virtual_column')

select partition_name, num_rows from user_tab_statistics where table_name = 'TEST_PART_VIRTUAL_COLUMN';

In pre - 11 g a trigger might help:

drop table test_part_nonvirtual_column purge;

-- pre 11g with trigger
create table test_part_nonvirtual_column
(
col1 date not null,
col2 varchar2(20),
col3 varchar2(2) not null
)
partition by list (col3)
(
partition p_00 values ('00'),
partition p_01 values ('01'),
partition p_02 values ('02'),
partition p_03 values ('03'),
partition p_04 values ('04'),
partition p_05 values ('05'),
partition p_06 values ('06'),
partition p_07 values ('07'),
partition p_08 values ('08'),
partition p_09 values ('09'),
partition p_10 values ('10'),
partition p_11 values ('11'),
partition p_12 values ('12'),
partition p_13 values ('13'),
partition p_14 values ('14'),
partition p_15 values ('15'),
partition p_16 values ('16'),
partition p_17 values ('17'),
partition p_18 values ('18'),
partition p_19 values ('19'),
partition p_20 values ('20'),
partition p_21 values ('21'),
partition p_22 values ('22'),
partition p_23 values ('23')
);

create trigger trg_test_part_nonvirtual_col
before insert
on test_part_nonvirtual_column
for each row
begin
  :new.col3 := to_char(:new.col1, 'HH24');
end;
/

insert into test_part_nonvirtual_column (col1, col2) values (to_date('17/01/2009 01:05:09', 'DD/MM/YYYY HH24:MI:SS'), '1');

insert into test_part_nonvirtual_column (col1, col2) values (to_date('17/01/2009 00:05:08', 'DD/MM/YYYY HH24:MI:SS'), '2');

insert into test_part_nonvirtual_column (col1, col2) values (to_date('24/01/2009 00:35:47', 'DD/MM/YYYY HH24:MI:SS'), '3');

commit;

exec dbms_stats.gather_table_stats(null, 'test_part_nonvirtual_column')

select partition_name, num_rows from user_tab_statistics where table_name = 'TEST_PART_NONVIRTUAL_COLUMN';

To the OP: why do you think you really need your table of partition by hours? Are you sure that this partitioning scheme is useful for the treatment of your data?

Kind regards
Randolf

Oracle related blog stuff:
http://Oracle-Randolf.blogspot.com/

SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676 /.
http://sourceforge.NET/projects/SQLT-pp/

Tags: Database

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