FIX: A clustering model that uses the K-means algorithm generates different results that are affected by PredictOnly columns in SQL Server 2008 R2 Analysis Services

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Article ID: 2525273 - View products that this article applies to.

Microsoft distributes Microsoft SQL Server 2008 R2 fixes as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 R2 fix release.
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SYMPTOMS

Consider the following scenario:
  • You create a clustering model by using the K-means algorithm in Microsoft SQL Server 2008 R2 Analysis Services.
  • The mining structure contains PredictOnly columns.
  • You change the position of PredictOnly columns in the mining structure or you remove the PredictOnly columns from the mining structure.

In this scenario, the mining model may generate different clustering analysis results unexpectedly.

RESOLUTION

Cumulative update information

The fix for this issue was first released in Cumulative Update 7. For more information about how to obtain this cumulative update package for Microsoft SQL Server 2008 R2, click the following article number to view the article in the Microsoft Knowledge Base:
2507770 Cumulative Update package 7 for SQL Server 2008 R2
Note Because the builds are cumulative, each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 R2 fix release. We recommend that you consider applying the most recent fix release that contains this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
981356 The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 was released

Service pack information for SQL Server 2008 R2

To resolve this problem, obtain the latest service pack for SQL Server 2008 R2. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2527041 How to obtain the latest service pack for SQL Server 2008 R2

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

This problem was first corrected in Cumulative Update package 7 for SQL Server 2008 R2.

MORE INFORMATION

Columns that are set to Predict Only are not used to build clusters. The distributions of these values in the clusters are calculated after the clusters are built.

For more information about the implementation of the Microsoft Clustering algorithm, visit the following Microsoft TechNet website:
Microsoft Clustering Algorithm Technical Reference
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 2525273 - Last Review: April 26, 2011 - Revision: 3.0
APPLIES TO
  • Microsoft SQL Server 2008 R2 Analysis Services
Keywords: 
kbqfe kbfix kbexpertiseinter kbsurveynew KB2525273

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