nag me why don't you :)
okay, this is how we are going to solve this... we are making the
primary key on the dimension table the number of the date. So, we want
to partition by month. Rather than add a date column to the fact table,
we are making the primary key of the date dimension table the yyyymmdd
for that row. (20020101 for January 1, 2002, etc) This goes into the
fact table. Then I range partition the fact table on yyyymm00 through
yyyymm99 for each partition that I build.
At least.. that's the plan.
- Jared.Still_at_radisys.com wrote:
> 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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Received on Tue Aug 06 2002 - 16:08:29 CDT
