Oracle-L: Re: Rolling partitions

From: <Jared.Still_at_radisys.com>
Date: Tue, 06 Aug 2002 10:18:25 -0800
Message-ID: <F001.004AC64C.20020806101825@fatcity.com>

This discussion raises an interesting question.

Do your fact tables have a date column in them?

If so, how do you correlate that with the date/time dimension table?

If you use a local date column to control the partitioning rather than a PK from the date/time dimension, user queries based on the date/time dimension won't be able to use partition elimination.

Personally, I see no need for a date column in the fact table.

Jared

paquette stephane <stephane_paquette_at_yahoo.com> Sent by: root_at_fatcity.com
08/06/2002 08:43 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
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        Subject:        Re: Rolling partitions

I've done that in a datawarehouse system. The fact tables were partitionned by date. Some fact tables were keeping different number of months : 6o, 12, 15,...
This was handle in the metadata tables and was written with PL/SQL (Oracle 8). You can do a lot of things with PS/SQL.
So the metadata was containg the table name, the naming convention of the partition, the naming convention for the tablespace, disks name, the number of partition per table, ...
Data was moved into retention data tables then the partition were rolling : creation of new tablespaces, creation of new partition, moving data to the retention tables, dropping partition,...

HTH

Tracy Rahmlow <tracy.rahmlow_at_aexp.com> a écrit :
> I am finally looking to implement partitioning and
> have some issues with
> rolling partitions by date. (Ie add partion p0802
> and drop p0801) Does
> anybody have or know of a generic procedure/process
> that will allow the
> automation of this? I envision a number of
> parameters being passed in. For
> example, time period & table ... Or is there an
> alternative that I need to
> consider? (other than manual)
>
> Thanks
>
>
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> Author: Tracy Rahmlow
> INET: tracy.rahmlow_at_aexp.com
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Stéphane Paquette
DBA Oracle, consultant entrepôt de données Oracle DBA, datawarehouse consultant
stephane_paquette_at_yahoo.com

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Received on Tue Aug 06 2002 - 13:18:25 CDT