RE: Partitioning by first digit of VARCHAR column data

From: <Surendra.Tirumala_at_ky.gov>
Date: Fri, 27 Aug 2004 07:46:07 -0400
Message-ID: <063F65E6A14D0C47A5E9954B3C32354407E51939@agency31.state.ky.us>

Thank you Connor!!
We have just decided to go for range on year and hash on varchar2.

Thanks again.
Surendra

-----Original Message-----
From: Connor McDonald [mailto:hamcdc_at_yahoo.co.uk] Sent: Thursday, August 26, 2004 10:51 PM To: oracle-l_at_freelists.org
Subject: Re: Partitioning by first digit of VARCHAR column data

Bang a trigger on to populate a new column and partition on that.

Alternatively, use dbms_utility.get_hash_value to see how your varchar2 map out across 4
partitions. You might be able to get away with just a range on year and hash on varchar2.

Connor

• Surendra.Tirumala_at_ky.gov wrote:
  > Hi,
  >
  > I have a table with several columns which include a NUMBER(year) and a
  > VARCHAR(some code) columns. The VARCHAR column has values that start with
  > either 1 or 2 or 3 or 4. I would like to have composite range partition
  key
  > based on YEAR and the first digit of the VARCHAR column. Is there any way
  I
  > can accomplish this? Can I use some function like SUBSTR to partition the
  > table based on first digit of VARCHAR column data?
  >
  > Thanks for your help.
  > Surendra
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  ---

Connor McDonald
Co-author: "Mastering Oracle PL/SQL - Practical Solutions" ISBN: 1590592174 web: http://www.oracledba.co.uk
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email: connor_mcdonald_at_yahoo.com

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Received on Fri Aug 27 2004 - 07:19:14 CDT