Advise on median MDX query and/or dimension hierarchy setup

Hey guys,
I have a fairly weird situation with SSAS/Dimension Hierarchies and an MDX based median-calculation that is actually not working as I would like it to work.
Hierarchy
- State
- County
- Town
- Neighborhood
- Filing Date
- Usage Category
- TransactionID (PRIMARY KEY)
I have a hierarchy set up which shall be used in order drill down the cube. The median, which shall be calculated based off the Sales Price measure and all the affected records, shall be available at every single level of the hierarchy. That is also why
I decided to use a hierarchy: I am at least not aware of a do-able alternative that would allow to use any available dimension without a hierarchy and calculate the median dynamically based off on that.
This is the MDX expression I use in order to calculate the median.
Median
      NONEMPTY(EXISTING Descendants( [Statistics Hierachy1].[Hierarchy].CurrentMember,
                   [Statistics Hierachy1].[Hierarchy].[Transaction Id])),
        [Measures].[Sale Price]
It works, and the numbers are correct, but it is way too slow in order to use it properly.
The hierarchy of dimension states that there is no relationship between the attributes of the hierarchy. That is right, because every single attribute is an attribute to the primary key (TransactionId).
So for me there are three ways to solve this:
1) Set up relationships. That, for some reason, brings up only a very limited subset of my data. Not sure why?
2) Get the hierarchy to work properly so it calculates the underlying median FASTER!
3) Set up a different measure (maybe my MDX is totally wrong?) to calculate the median the right way? In the end the median needs to be calculated based off on all underlying transactions that make up to the current level of the hierarchy.
In the end we are not talking about a ultra-large cube. Right now it only has like 3.1 Million rows in its one single partition.
Can anybody of you help me to address either the issue I am facing with the hierarchy (one I set up the relations I only see a subset of data) and/or let me know how to set up the median measure the right way ?
Thanks in advance! I really appreciate any help!
Thanks,
Lars

Hi L,
I would encourage you to set up the attribute hierarchies. That will make your calculation much faster, the further down the user is in the hierarchy. This is because the nonempty set you are getting the median from will be much smaller.
As you point out, to have an attribute hierarhcy, you need to have keys that cascade down, which you haven't got, at least yet. One simple way around this is to use composite keys all the way down the hierarchy. ie. State just has State as key,
County has State and County as key, Town has State, County and Town in key etc. I can assure you that this will make you calc much faster down the hierarchy.
One side effect you will have is that attributes will now be unique based on their parents. Two towns with the same name in different states or counties will appear as separate towns. You may or may not want this. If you don't want it,
simply have two Town attributes, call one TownKey (with composite key) which will be invisible as an attribute but used in the hierarchy. The other Town attribute simply has Town as the key, so it can be used as an attribute on its own. Town attribute
can be an attribute of TownKey.
Hope that makes sense,
Richard

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Hi mkm1,
According to your description, you want to use C# code to generate MDX Query. Right?
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References.
http://www.databasejournal.com/features/mssql/article.php/3306101/MDX-Essentials-Basic-Set-Functions-The-Filter-Function.htm
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/c0149678-97f2-4066-903f-7f9e9ff09b56/filtering-out-dimension-members-with-mdx?forum=sqlanalysisservices
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Charlie Liao
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Web intelligence and sap bw hierarchy

Hi all,
we are trying to build a report based on bex query and using bw hierarchy.
We can create the report in an easy way with dimnesion customer (using hierarchy) and measure unit sales and it look pretty good. But when we add next dimension into our report the result isnt how we imagined. Take a look please at these two pictures. The first is how the report looks like now and the second is how it should look like.
1. picture how it looks like now - http://img202.imageshack.us/img202/6708/sapbwhierarchyinwebi.jpg
2. picture how it should look like - http://img507.imageshack.us/img507/7043/sapbwhierarchyinwebithi.jpg
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Thanks for any help,
regards Martin Zluky
Edited by: Martin Zluky on Oct 26, 2011 5:00 PM
Edited by: Martin Zluky on Oct 26, 2011 5:04 PM

Hi Martin,
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Inkey Solutions, India.
Microsoft Certified Business Management Solutions Professionals
http://www.inkeysolutions.com/MicrosoftDynamicsCRM.html

Can anybody please advise what are the ways to get the required sum of [Measures].[Amt] and count of [Customer].[Customer].[Customer Key].ALLMEMBERS dimension?
Also, does it make any difference if I manage it as SSRS level and not at MDX query level?
Hi Ankit,
We can use SUM function and COUNT function to sum of [Measures].[Amt] and count of [Customer].[Customer].[Customer Key].ALLMEMBERS dimension. Here is a sample query for you reference.
WITH MEMBER [measures].[SumValue] AS
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MEMBER [measures].[CountValue] AS
COUNT([Customer].[Customer].ALLMEMBERS)
MEMBER [Measures].[DimensionName] AS [Customer].NAME
SELECT {[Measures].[DimensionName],[measures].[SumValue],[measures].[CountValue]} ON 0
FROM [Adventure Works]
Besides, you ask that does it make any difference if I manage it as SSRS level and not at MDX query level. I don't thinks it will make much difference. The total time to generate a reporting server report (RDL) can be divided into 3 elements:Time to retrieve
the data (TimeDataRetrieval);Time to process the report (TimeProcessing);Time to render the report (TimeRendering). If you manage it on MDX query level, then the TimeDataRetrieval might a little longer. If you manage it on report level, then the TimeProcessing
or TimeRendering time might a little longer. You can test it on you report with following query:
SELECT Itempath, TimeStart,TimeDataRetrieval + TimeProcessing + TimeRendering as [total time],
TimeDataRetrieval, TimeProcessing, TimeRendering, ByteCount, [RowCount],Source
FROM ExecutionLog3
WHERE itempath like '%reportname'
Regards,
Charlie Liao
TechNet Community Support

SSRS MDX Query Dimension Properties Missing

I have been stumped on this for a few days thought I'd throw this out here. I've read every related article in the forum regarding MDX Queries and Dimension Properties in SSRS Report Developer and haven't found a case exactly like this with a solution that
works.
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NON EMPTY {
[Value_Stream_Project].[Value_Stream_Project].ALLMEMBERS *
[Project Status_Project].[Project Status_Project].ALLMEMBERS *
DESCENDANTS([Project List].[Project List Level 02].ALLMEMBERS)*
DESCENDANTS([ProjectManager_Project].[ProjectManager_Project Level 02].ALLMEMBERS) *
[Planner_Project].[Planner_Project].ALLMEMBERS *
[Time].[Month].ALLMEMBERS
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MEMBER_UNIQUE_NAME,
PARENT_UNIQUE_NAME,
LEVEL_NUMBER ,
[Project List].[Project List Level 02].[Start Date],
[Project List].[Project List Level 02].[Finish Date]
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FROM (
SELECT ( STRTOMEMBER(@FromTime, CONSTRAINED) : STRTOMEMBER(@ToTime, CONSTRAINED) ) ON COLUMNS
FROM (
SELECT ( STRTOSET(@RBSResource, CONSTRAINED) ) ON COLUMNS
FROM (
SELECT ( STRTOSET(@ProjectStatusProject, CONSTRAINED) ) ON COLUMNS
FROM (
SELECT ( STRTOSET(@ValueStreamProject, CONSTRAINED) ) ON COLUMNS
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[Project List].[Start Date],
[Project List].[Finish Date]
The Query designer shows the properties in the output but leads to 2 other issues,
1) I have to modify the generated Dataset field values to remove the [Project list Level 02] in the Level unique name like this
Before<?xml version="1.0" encoding="utf-8"?><Field xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:type="MemberProperty" PropertyName="Project List - Start Date" LevelUniqueName="[Project List].[Project List Level 02]" />
After
<?xml version="1.0" encoding="utf-8"?><Field xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:type="MemberProperty" PropertyName="Project List - Start Date" LevelUniqueName="[Project List]" />
2) I have to restrict my cross join to only the current level (Level 02) or it expands the results to the parent hierarchy of the Project List dimension and skews my measure summaries.
I've tested the query in SSMS directly and the properties are showing up just fine for those dimensions using the original syntax.
Any help would be appreciated.

Hi there,
Which data source provider are you using? Are the connection strings used in SSMS the same as SSRS? Doing a profiler trace against Analysis Services might point to differences in how the connection is made or query is parsed.
This may help.
http://www.sqlchick.com/entries/2011/10/23/pros-cons-of-using-the-ole-db-provider-for-ssas-100-when-rep.html
Did you try using With clause to make a friendly name for the member properties?
http://melick-rajee.blogspot.ca/2012/04/how-to-get-member-properties-in-mdx.html
cheers,
Andrew
Andrew Sears, T4G Limited, http://www.performancepointing.com

Advise on median MDX query and/or dimension hierarchy setup

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