FIX: Slow performance when you run an MDX query that uses some sub queries in SSAS 2008 R2 or in SSAS 2012

Article ID: 2675233
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Microsoft distributes Microsoft SQL Server 2008 R2 Service Pack 1 (SP1) or Microsoft SQL Server 2012 fixes in one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security updates that were included with the previous SQL Server 2008 R2 Service Pack 1 (SP1) or SQL Server 2012 update release.

Symptoms

When you try to run a Multidimensional Expressions (MDX) query that uses some sub queries in Microsoft SQL Server 2008 R2 Analysis Services (SSAS 2008 R2) or in Microsoft SQL Server 2012 Analysis Services (SSAS 2012), it might take a long time to run the MDX query.

Note This issue is more likely to occur when both the dimensions and the measure groups are stored in Relational Online Analytical Processing (ROLAP) storage mode.

Cause

This issue occurs because the subcube's data is treated incorrectly as non-cache data when it is cached. Therefore, additional SQL queries are run to obtain the data from storage instead of from the cache. This results in slow performance.

Resolution

Cumulative update information

SQL Server 2008 R2 Service Pack 2

The fix for this issue was first released in Cumulative Update 1 for SQL Server 2008 R2 Service Pack 2. For more information about how to obtain this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:
2720425 Cumulative Update package 1 for SQL Server 2008 R2 Service Pack 2
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:
2730301 The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 Service Pack 2 was released

SQL Server 2012

The fix for this issue was first released in Cumulative Update 2 for SQL Server 2012. For more information about this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:
2703275 Cumulative update package 2 for SQL Server 2012
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 2012 fix release. Microsoft recommends 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:
2692828 The SQL Server 2012 builds that were released after SQL Server 2012 was released
You must apply a SQL Server 2012 hotfix to an installation of SQL Server 2012.

Cumulative update package 6 for SQL Server 2008 R2 SP1

The fix for this issue was first released in Cumulative Update 6. For more information about how to obtain this cumulative update package for SQL Server 2008 R2 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:
2679367 Cumulative update package 6 for SQL Server 2008 R2 SP1
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 Service Pack 1 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:
2567616 The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 SP1 was released

Status

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

Properties

Article ID: 2675233 - Last Review: November 21, 2012 - Revision: 5.1
Keywords: 
kbtshoot kbqfe kbfix kbexpertiseadvanced kbsurveynew KB2675233

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