Do you mean 3 different tables with time dimensions?
I foresee problems with that...
Jared
paquette stephane <stephane_paquette_at_yahoo.com>
Sent by: root_at_fatcity.com
08/06/2002 12:28 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
cc:
Subject: Re: Rolling partitions
Yes this is an interesting question, I remember we
have debated on do we use a generated key or not for
the time dimension. We used a date field as the daily
time dimension key, the time portion of the date field
was truncated.
This was in 1997.
We had 3 time dimensions , a daily one, a monthly one
and a production one ( 2 weeks of 4 days, then 1 week
of 5 days, then 2 weeks of 4 days,....)
- Jared.Still_at_radisys.com a écrit : > 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>
> cc:
> 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
> >
> >
> > --
> > Please see the official ORACLE-L FAQ:
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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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Stéphane Paquette
DBA Oracle, consultant entrepôt de données
Oracle DBA, datawarehouse consultant
stephane_paquette_at_yahoo.com
Do You Yahoo!? -- Une adresse @yahoo.fr gratuite et en français !
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Received on Tue Aug 06 2002 - 19:12:26 CDT
