Multiple hierarchies with a shared higher level in OBIEE

Hello all,
I'm trying to create multiple hierarchies for a shared dimension in OBIEE. I have gotten these to work in the past when each hierarchy for the dimension all shares the common “grand total” level at the top, but I now I'd like multiple hierarchies that share a common higher level that isn't the grand total level.
Here's what I'm trying to do with a Customer Geography hierarchy. I want to give the user the option to drill from the customer "Country" and go either into "Cities" or "States":
Grand Total level
--->Country level
------> State level
---------> Customer detail level
------> City level
---------> Customer detail level
So "Country" is the common parent of "State" and "City", and "State" and "City" each have" Customer detail" as the lowest level. The Admin Tool let's me build exactly this in my RPD (with no errors/warnings), but when I go to drill on Country in an Answers report, I don't get the option to navigate down to State or City; it just automatically drills into the underlying states -- never shows cities.
I guess I was hoping there'd be a pop up option to ask the user which path I wanted to drill down on (kind of like what shows up for multiple navigation targets in an Answers request).
Am I missing a setup step in my RPD for this multiple hierarchy? Is a shared higher level multiple hierarchy even possible in OBIEE?
Thanks,
Jeremy
Edited by: OBI Wan on Mar 19, 2009 3:29 PM
Edited by: OBI Wan on Mar 19, 2009 3:30 PM
Edited by: OBI Wan on Mar 19, 2009 11:20 PM

Thanks mma for the help. I thought I saw in your reply this link as well to RittmanMead, but it's not showing up now?
http://www.rittmanmead.com/files/Advanced%20Development%20using%20OBIEE%20(ODTUG%202008).pdf
Anyway, on slide 37 of Rittman's presentation, that screen shot he has of Country, City, and State is exactly what I am attempting to do. I was hoping my issue would be a bit more straightforward than the recommended ragged hierarchy work arounds, but I may still have to do something like that in the end.
This issue just seems more simple than ragged hierarchies, because I start from the same level and end up back at the exact same level (instead of different destination levels as can be the case in ragged hierarchies). I don't know -- maybe my example is ragged as well.
If Rittman got that hierarchy in his screen shot on slide 37 to work like I'm trying to, then that would be perfect. :)

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Mike,
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Mike,
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Morning,
the purpose of this discussion is to understand how we should design a specific dimension with 3 levels and multiple hierarchies for optimal performance.
We have an institution dimension with the following characteristics:
Characteristics
Dimension: Institution
Levels:
1. Total Bank (TB) Level
2. Peer Group (PG) Level
3. Institution Level
Hierarchies:
1. Some of the hierarchies have 3 levels and others have only 2 levels (Skip Level)
2. ALL the hierarchies have a TB level and an Institution level
3. None of the hierarchies have the same leafs
4. Some of the hierarchies leafs can overlap
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We are considering two approaches for the institution dimension levels:
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Levels:
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Hierarchy 1 Inst Level
Hierarchy 2 TB Level
Hierarchy 2 Inst Level
Hierarchy 3 TB Level
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This approach is working and the resulting dimension and cubes are used by OBIEE, but some of the OBIEE analysis takes a long time (more than a minute) to return the results.
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No, it is not possible to have multiple hiearchies in a PC logical dimension.
The concept of the Parent-Child (PC) hierarchy is completely different from the level-based hierarchy. Specifically the PC hierarchy expects a predefined / architected table with corresponding PC column/value structuring with or without attributes.
Short story even shorter it is not possible.
Longer...
In the RPD the BMM actually prevents you from adding a new logical level, child level, or parent level when you have selected that the logical dimension be a parent child logical dimension with Parent-Child hierarchy.
On another note...
Have you tried architecting/building your PC source table so that it represents the roll-up and bottom child-levels like you are seeking? That is, that same member in the child column more than once having a separate parent value. That should be doable.
That was a great question, please award points if this answered your question or it was helpful.
Cheers,
Christian
http://www.artofbi.com

Query selected levels of multiple hierarchies of one dimension

Hi to all.
I have created through AWM 11 a customer dimension with two hierarchies as follows.
SLM_HIER: All Customers -> Salesman -> Customer
GEO_HIER: All Customers -> State -> City -> Customer
I have also created a SALES_CUBE (measures: QUANTITY, VALUE, aggregation: SUM) that is dimensioned with Customer dim.
I'm using OBIEE to query the OLAP engine (through the relational views that AWM created automatically). I have followed the OTN OBE tutorials.
I would like to have the following query on the cube:
Give me QUANTITY where SALESMAN=S1 and CITY in ('Athens','Rome').
Is it possible to have such a query? As far as I understand there are no ready aggregated data for selected levels of both hierarchies.
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I think OBIEE would also give you your answer from OLAP.
This query has filters defined from both the hierarchies and hence OBIEE would (should) automatically service this query from the highest common level b/w the hierarchies (in this case: base/leaf level - Customer). As a result of this, if CUST is your Customer dimension, OBIEE (at least, the older style of obiee modeling with olap) would introduce the security filter CUST_LEVEL = 'Customer'. Granularity of the resultset returned would be per individual Customer. 1 record per Customer satisfying the criteria SALESMAN='S1' and CITY in ('Athens','Rome').
Ideally you should include the Cust Id, Quantity columns in your obiee answers report and use an internal answers object/view like a Pivot View to hide Customer details column and get a localized aggregation performed over the resultset returned from OLAP to get the consolidated Quantity. Answers table has data at Customer level, Answers Pivot can show the required result.
Note1: The Cube cannot have this result pre-calculated since its a contradictory combination of filters across hierarchies. Level specific aggregate values calculated (or pre-calculated) in the cube for Salesman level (h1) would contain Customers from all cities (h2) and similarly City level (h2) Aggregates would contain Customers of all Salesmen (h1).
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HTH
Shankar

SSM7.5 - Dimension with Multiple Hierarchies

Hi all,
I'm facing here one problem in the SSM front-end when I'm trying to use one the possibilities that PAS database offers, in this case the use of a dimension with multiple hierarchies.
As you can see in this image, the dimension is created in PAS and works without problems in the dataview.
Hierarchy one:
[http://img121.imageshack.us/img121/334/pas1y.jpg]
Hierarchy two:
[http://img831.imageshack.us/img831/2586/pas2.jpg]
In the SSM front-end, when I try to use that dimension, by default appears the first hierarchy:
[http://img826.imageshack.us/img826/4043/hier3.jpg]
In the dimensional selector the dimension appears fine for the first hierarchy:
[http://img30.imageshack.us/img30/3103/hier1.jpg]
But when I select the second hierarchy...
[http://img34.imageshack.us/img34/1722/hier2.jpg]
The Internet Explorer crashes and close all the open windows. This happens in the scorecard and also in the reports.
Is not possible to use dimensions with multiple hierarchies in SSM? Did anyone had this problem before?
Thanks in advance
Pedro
Edited by: Pedro S. Costa on Sep 13, 2010 11:03 AM

Hi Shashi,
first of all, thanks for your answer.
But I don't understand when you say that "we cannot have two hierarchies on the same dimensions"?!?!?
I already have some years of experience with PAS database and it's not the first time I create a dimension with more than one hierarchy. I use also that in a productive system (before this SSM front-end) without problems. And in this latest version of PAS (version 7.5.6) it's still possible to use that feature. As you can see in my initial post, I put two screen shots of the dimension with two hierarchies in PAS dataview, and works fine, without problems in the drill-down/up.
From PAS online help:
HIERARCHY is a Dimension command that defines the members and levels that comprise a particular hierarchy level within a dimension. It also allows multiple consolidation structures that stem from a central root of inputs. Use hierarchies when the input members are consolidated into more than one output member. When a dimension has hierarchies, members can have more than one path for rolling up into output levels. If a dimension has only one hierarchy, no HIERARCHY statement is necessary.
Based on this, I create my example of a dimension (named MULTI) with two hierarchies (REGION and TYPE). Maybe the name I use for the second hierarchy create some confusion to you, because of the TYPE dimension that can exist in SSM. I just hope the problem I'm having in the SSM front-end is not related with the name I used for the second hierarchy!!!!
I will rename that and test again.
Regards
Pedro

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Is it possible to have in a parent-child dimension multiple hierarchies? I want to have the same botom childs to aggregate to different parrents. example.
Account Dimension
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HR1-parrent1
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HR1-parrent2
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HR2-total
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No, it is not possible to have multiple hiearchies in a PC logical dimension.
The concept of the Parent-Child (PC) hierarchy is completely different from the level-based hierarchy. Specifically the PC hierarchy expects a predefined / architected table with corresponding PC column/value structuring with or without attributes.
Short story even shorter it is not possible.
Longer...
In the RPD the BMM actually prevents you from adding a new logical level, child level, or parent level when you have selected that the logical dimension be a parent child logical dimension with Parent-Child hierarchy.
On another note...
Have you tried architecting/building your PC source table so that it represents the roll-up and bottom child-levels like you are seeking? That is, that same member in the child column more than once having a separate parent value. That should be doable.
That was a great question, please award points if this answered your question or it was helpful.
Cheers,
Christian
http://www.artofbi.com

Does anyone have a sample implementation plan that can be shared? High level?

Does anyone have a sample implementation plan that can be shared? High level?

You will probably need to inquire with a VMware consultant to get this kind of information. VMware depends on these people to make sure they keep the reputation of the software at a very high level.
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"correct"
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www.myvmland.com

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