OBI EE 10g: Bridge tables and Based on Dimensions Aggregation

hi experts,
i am working on OBI EE 10 g (10.1.3.4)
The BM&M layer consist of:
1) Logical fact table "Sale_Indicators"
Fields: SALE_ID (PK, FK),
D1_ID (FK),
D2_ID (FK),
Indicator1 (measure, level of granularity: SALE_ID),
Indicator2 (measure, level of granularity: SALE_ID),
Indicator3 (measure, level of granularity: SALE_ID)
2) Logical dimension table
"Sales" (PK: SALE_ID),
"D1" (PK: D1_ID),
"D2" (PK: D2_ID),
"Customers" (PK: SALE_ID, CUST_ID) - bridge table!
"Products" (PK: SALE_ID, PROD_ID) - bridge table!
3) Dimensions: SalesDim, D1Dim, D2Dim, CustomersDim, ProductsDim
If fact table is joined with bridge table, the number of rows in fact table is multiplied, for example:
D1_ID | SALE_ID | CUST_ID | Indicator1
777 | 1 | 14 | 10
777 | 1 | 17 | 10
777 | 2 | 15 | 12
888 | 3 | 16 | 20
888 | 3 | 17 | 20
888 | 4 | 19 | 30
I need to get report:
D1_ID | Indicator1 (SUM)
777 | 22
888 | 50
and with filter by customer, for example (CUST_ID = 17):
D1_ID | Indicator1 (SUM)
777 | 10
888 | 20
i am trying to use "based on dimension" aggregation, for example (Indicator1):
Dimension Formula
CustomersDim MIN
ProductsDim MIN
Others SUM
The generated physical SQL performs joining EVERY dimension to the fact table, even though they are not included in the final result set.
Is there any way to tweak logical or physical model in order to eliminate excessive joins?
Thanks in advance!
Edited by: 859688 on 31.10.2011 4:04
Edited by: 859688 on 31.10.2011 4:06
Edited by: 859688 on 31.10.2011 4:08

I found this text on the help, but I didn't understand, because when I check the "based on dimensions" check box, I can choose aggregation rules for each dimension, not only the time dimension.
Also, I found in the help menu:
"In the Aggregation tab, select the Based on dimensions check box.
The Browse dialog box automatically opens.
In the Browse dialog box, click New, select a dimension over which you want to aggregate, and then click OK.
In the Aggregation tab, from the Formula drop-down list, select a rule."
I did the same steps suggested by the text above, but it didn't work.

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Based on dimension aggregation

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I found this text on the help, but I didn't understand, because when I check the "based on dimensions" check box, I can choose aggregation rules for each dimension, not only the time dimension.
Also, I found in the help menu:
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Thanks

Hi,
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Regards,
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Hi everyone!
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How to define an aggregation rule for a dimension based on bridge table?

Hello,
I need a solution for aggregating data correctly when using a dimension based on a set of dimensione tables containing a bridge table. Please find below a description of my business case and the OBIEE model which I’ve created thus far.
Business Case
The company involved wants to report on the number of support cases, the different types of actions that were taken and the people involved in those actions. One support case will undergo a number of actions (called ‘handelingen’) until it is closed. For each action at least one person is involved performing a specific role, but there can also be multiple persons involved with 1 action, each performing a different role for that action. This is the N : N part of the model.
The problem that I face is visible in the two pictures below:
http://i84.photobucket.com/albums/k24/The_Dutchman_2006/OBIEE/sample.png
As long as I don’t include anything from the Dimension Meelezer in my report, I get the correct number of handelingen (7). When I include the person (called ‘Meelezer’), the measuere per action is multiplied by the number of persons/roles involved with that action.
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http://i84.photobucket.com/albums/k24/The_Dutchman_2006/OBIEE/sample2.png
I believe it should be possible to define in the repository a different aggregation rule for individual dimensions, but I’ve not been able to achieve this.
Explained below is what I have created in my Physical and Business Model & Mapping layers:
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(This is just a small part of a much larger physical model, but I’ve only included the most relevant tables)
http://i84.photobucket.com/albums/k24/The_Dutchman_2006/OBIEE/PhysicalDiagram-1.png
The Fact table (ALS Feit Zaakverloop) contains FK’s for the action (FK_HANDELING, joined to ALS Dim Handeling), the date the action took place (FK_DATUM_ZAAKVERLOOP, joined to ALS Dim Datum Zaakverloop) and the uniqe group of people involved (FK_MEELEZERS, joined to ALS Groep Meelezers) and a measure column (SUM_HANDELINGEN) populated with the value ‘1’ for each row.
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The Business Model
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http://i84.photobucket.com/albums/k24/The_Dutchman_2006/OBIEE/BusinessModel-1.png
DIM Meelezer contains one LTS in which the four physical tables have been combined:
http://i84.photobucket.com/albums/k24/The_Dutchman_2006/OBIEE/LTS1.png
And all the required locical columns have been created:
http://i84.photobucket.com/albums/k24/The_Dutchman_2006/OBIEE/LTS2.png
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http://i84.photobucket.com/albums/k24/The_Dutchman_2006/OBIEE/BMDIM.png
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http://i84.photobucket.com/albums/k24/The_Dutchman_2006/OBIEE/Hier.png
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Edited by: The_Dutchman on Dec 13, 2011 11:43 AM

Hmm, no replies yet...
Am I in 'uncharted territory' with this issue?

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I am having a little trouble using bridge tables. For testing I created an n-n relation. When I just make joins it shows the link table like fact table but queries work okay. When I check the bridge table check box, it identifies the correct fact and dimension tables, but I get a consistecy warning since one of the dimension tables does not join to any fact table and also querires don't work.
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Hi,
Find the link below which might help you.
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Bridge Table

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Hi User -
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Here is a really good article written by Mark Rittman discussing bridge tables and their uses:
http://www.rittmanmead.com/2008/08/28/the-mystery-of-obiee-bridge-tables/
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There are 2 ways to model many-to-many relationships.
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Hi,
My question is -->What is the difference it makes if we check that VS don't check that. Is it mandatory to check it?
And we are following the first approach out of the 2 approaches listed below.
There are 2 ways to model many-to-many relationships.
1. Perform Fact-->Bridge and Bridge-->Dimension join in physical layer. In BMM layer, bring Fact and Dimension tables. Do an inner join between Bridge-->Dimension and join the Dimension to the Fact.
Question:- In this case do we need to check the Bridge Table check box on the Dimension table?
2. Perform Fact-->Bridge and Bridge-->Dimension join in physical layer. In BMM layer, bring Fact, Bridge and Dimension tables. Fact-->Bridge and Bridge-->Dimension.
Question:- In this case do we need to check the Bridge Table check box on the Bridge table?
Thanks,
Anilesh

OBI EE 10g: Bridge tables and Based on Dimensions Aggregation

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