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RE: Partitioning Quandry

From: Toepke, Kevin M <ktoepke_at_trilegiant.com>
Date: Tue, 30 Apr 2002 10:24:08 -0800
Message-ID: <F001.00453C4E.20020430102408@fatcity.com> 





Thanks to Dennis, I found that partitioning on a concatenated key solves my
dilema.



For those who are interested, here is my new partitioning clause:


    PARTITION BY RANGE (invoice_state, update_date) (

        PARTITION inv_active  VALUES LESS THAN
            ('B', TO_DATE('01-jan-9999', 'DD-MON-YYYY'))
            TABLESPACE fins_sml_tbl
       ,PARTITION inv_paid_00 VALUES LESS THAN
            ('P', TO_DATE('01-jan-2001', 'DD-MON-YYYY'))
            TABLESPACE fins_sml_tbl
       ,PARTITION inv_paid_01 VALUES LESS THAN
            ('P', TO_DATE('01-jan-2002', 'DD-MON-YYYY'))
            TABLESPACE fins_sml_tbl
       ,PARTITION inv_paid_02 VALUES LESS THAN
            ('P', TO_DATE('01-jan-2003', 'DD-MON-YYYY'))
            TABLESPACE fins_sml_tbl

The following table shows where records go:
	invoice_state		update_date			partition


	'A'				does not matter		inv_active

	'P'				< '01-jan-2001'		inv_paid_00

	'P'				< '01-jan-2002'		inv_paid_01

	'P'				< '01-jan-2003'		inv_paid_02





The kicker is that when doing concatenated key range partitioning, the first
column in the key has to be EQUAL to the value for the 2nd column to be
considered!



Caver



-----Original Message-----


Sent: Tuesday, April 30, 2002 12:53 PM


To: Multiple recipients of list ORACLE-L




Kevin - This sounds similar to a partitioning issue that I was able to
resolve. My suggestion is to consider partitioning on a concatenated key,
INVOICE_STATE, UPDATE_DATE. You'll have to play with it, the partitions
don't work the way you think they do. As I recall, if you say "less than
'AL', '01-DEC-02' it will actually partition on values that equal 'AL', but
less than '01-DEC-02'. I haven't done dates myself, so I probably have the
syntax wrong. The part about sub-partitioning some partitions, should work
as well, since your syntax is "less than". If this isn't making sense, email
me directly.


Dennis Williams


DBA



Lifetouch, Inc.


dwilliams_at_lifetouch.com




-----Original Message-----


Sent: Tuesday, April 30, 2002 10:04 AM


To: Multiple recipients of list ORACLE-L




here's one for the partitioning gurus out there....



I have an INVOICE table that I want to partition for performance and
purging. The way I want to partition it is to do range partitioning on the
INVOICE_STATE column, then sub-partition some of the partitions by
UPDATE_DATE. 


The logic behind this is:


1)	An invoice may be in sent, but unpaid ("A") state for several
months.

2)	We never want to purge off unpaid invoices
3)	After an invoice has been in paid ("P") state for 6 months, we want


to purge the invoice



My basic idea was to have partition-movement enabled and to use a
partitioning scheme like the following:


TABLE invoice (


        invoice_id, invoice_state, update_date, ...
) partition by range (invoice_state) (


    partition inv_act values less than 'B'
   ,partition inv_hist values less than 'R'

	subpartition by range (update_date) 
		....




);



Alas, you can only subpartition by HASH (or LIST in 9iR2) The only solution
I can come up with is a 2 table solution -- keeping the unpaid invoices in
one table and the paid invoices in another table that is range partitioned
on UPDATE_DATE. The difficulties with this solution are coding the row
movements (bi-directional) and having to code a partition-view.



Any suggestions would be helpful.



Kevin Toepke


ktoepke_at_trilegiant.com








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Received on Tue Apr 30 2002 - 13:24:08 CDT












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