RE: Data Warehouse experts, a simple question for you| Outdated?

Ian,

Good question. I think that I've seen more recenct references in articles that state the current thinking of DW/DM. I'm sure that I've seen Inmon refer to them that way, or maybe it was Richard Winter?

Anyway, I guess that part is a bit dated. There is so much good information
in that book though, that it's still worth its weight in gold. You won't find too many
publications for $60 that will take you step by step through building an entire
data warehouse, including the infrastructure.

Jared

"MacGregor, Ian A." <ian_at_SLAC.Stanford.EDU> Sent by: root_at_fatcity.com
05/21/2002 05:48 PM
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        Subject:        RE: Data Warehouse experts, a simple question for you| Outdated?

I am new to his books, three chapters in. The first release of the "Data Warehouse Toolkit" defines a data warehouse much as a data mart is today.  Today we think of a data warehouse as having a highly normalized structure which stores information from various sources. We build data marts with structures optimized for querying; e.g., star schemas, from the  warehouse. Kimball writes of the warehouse itself being based on a star schema.

The term data warehouse has not been immutable over the years. It was probably defined exactly as he has done when the book was first written. Do his new books redefine "data warehouse"?

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_SLAC.Stanford.edu

-----Original Message-----
Sent: Tuesday, May 21, 2002 2:16 PM
To: Multiple recipients of list ORACLE-L

I second Jared's opinion. Ralph's books are clear and easy to read. This is
the fundamentals of data warehousing.
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Tuesday, May 21, 2002 2:30 PM
To: Multiple recipients of list ORACLE-L

Yup, $60, and worth every penny.

It may be 4 years old, but the information is still pertinent.

Jared

Joe Testa <jtesta_at_dmc-it.com>
Sent by: root_at_fatcity.com
05/20/2002 05:53 PM
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        Subject:        Re: Data Warehouse experts, a simple question for

looks like published aug of 98 for that book?, like $60?

joe

Jared.Still_at_radisys.com wrote:

>Joe,
>
>Add a generated PK to the time dimension. The PK is stored
>as an FK in the fact table.
>
>That way you can select from the time dimension by year, day, qtr,
>whatever,
>and easily pick out the correct fact table rows.
>
>"The Data Warehouse Lifecycle Toolkit" includes a spreadsheet to generate
>the DDL/DML for a very robust time dimension. I think it has about 20
>columns.
>
>Very good book, can't recommend it enough.
>
>Jared
>
>
>
>
>
>
>Joe Testa <jtesta_at_dmc-it.com>
>Sent by: root_at_fatcity.com
>05/20/2002 04:08 PM
>Please respond to ORACLE-L
>
>
> To: Multiple recipients of list ORACLE-L
<ORACLE-L_at_fatcity.com>
> cc:
> Subject: Data Warehouse experts, a simple question for you
>
>
>Ok i'm messing with dimensions.
>
>dm_time to be exact:
>
>create table dm_time
>( calendar_date date not null,
> calendar_month number(2) not null,
> calendar_qtr number(1) not null,
> calendar_year number(4) not null);
>
>insert into dm_time values(to_date('20020101','YYYYMMDD'), 1,1,2002);
>insert into dm_time values(to_date('20030101','YYYYMMDD'), 1,1,2003);
>
> 2 rows nice and simple
>
> trying to validate the dimension comes up with an error, my guess is
>because of the design of the table
>
> where basically calendar_date is child of
> calendar_month is child of calendar_qtr is child of calendar_year,
>wont validate.
>
>- the question i have is this, should month really be like 2002-01 with
>the year included, likewise with qtr, then it
>will validate ok.
>
>Was the design of dm_time just dont wrong or am i missing something here.
>
>thanks, joe
>
>

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