Oracle-L: RE: Partitioning Quandry

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Tue, 30 Apr 2002 08:53:29 -0800
Message-ID: <F001.00453994.20020430085329@fatcity.com>

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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Author: Toepke, Kevin M
  INET: ktoepke_at_trilegiant.com

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Received on Tue Apr 30 2002 - 11:53:29 CDT