Question

SSAS 2008 and MDX: What is the fastest way of segmenting a set in MDX?

Asked by: carlkelley

We have an SSAS 2008 cube that stores revenue by line-of-business (LOB) for each Company.  Each company will have revenue in a subset of LOBs.  We need to divide the set of all Companies into two sets:  
1.  Companies with at least one LOB that exceeds some cutoff and
2.  Companies that have no LOB with revenue that exceeds the cutoff.  
There is an [Organization] and an [LOB] dimension.  What MDX expression is the fastest way to segment the set of all Organizations into two sets by an arbitrary cutoff given that the set of selected LOBs may change?  I'm hoping that you can come up with something that is much faster than the following code snippet:

with
set [CompaniesWithRevenue] as NonEmpty([Company].[All].Children, [Measures].[LOB Revenue])
set [CompaniesAboveCutoff] as filter([CompaniesWithRevenue], Max(Existing [LOB].Members, [Measures].[LOB Revenue]) > CUTOFF)
set [CompaniesBelowCutoff] as ([CompaniesWithRevenue] - [CompaniesAboveCutoff] )
                                  
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Asked On
2009-07-24 at 02:38:58ID24597342
Tags

SSAS 2008 MDX

Topics

OLAP

,

MS SQL Server

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: agandauPosted on 2009-07-24 at 12:37:18ID: 24938336

How long is your current query taking?

 

by: carlkelleyPosted on 2009-07-25 at 02:30:15ID: 24941125

About 200ms for 1,700 companies on a quad-core Vista Ultimate PC running Sql Server 2008 Enterprise.  We expect the number of companies to grow dramatically.

 

by: agandauPosted on 2009-07-28 at 12:46:05ID: 24964419

How long does this take:

with
set [CompaniesWithRevenue] as NonEmpty([Company].[All].Children, [Measures].[LOB Revenue])
set [CompaniesAboveCutoff] as 
	extract(
		filter(
			[CompaniesWithRevenue] * [LOB].Members, 
			[Measures].[LOB Revenue] > CUTOFF
		),
		[Company] -- extract only company members from filtered crossjoin
	)
set [CompaniesBelowCutoff] as ([CompaniesWithRevenue] - [CompaniesAboveCutoff])

                                              
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by: carlkelleyPosted on 2009-07-30 at 15:13:45ID: 24984854

Your suggestion yeilded the same results by took 24 seconds.

 

by: carlkelleyPosted on 2009-08-14 at 07:27:30ID: 31607385

I'm giving up on this question due to lack of response in a timely manner.  The world turns and this is no longer an issue.

20120131-EE-VQP-002

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