Microsoft KB Archive/941611

= FIX: The performance of the MDX queries may be very slow when you run many MDX queries in SQL Server 2005 Analysis Services =

Article ID: 941611

Article Last Modified on 9/4/2007

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APPLIES TO


 * Microsoft SQL Server 2005 Analysis Services

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Bug #: 50000872 (SQL Hotfix)



Microsoft distributes Microsoft SQL Server 2005 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 2005 fix release.



SYMPTOMS
Consider the following scenario. In Microsoft SQL Server 2005 Analysis Services, you run many Multidimensional Expressions (MDX) queries. The MDX queries contain a slice of some child attributes that are related to a parent attribute in a parent/child hierarchy. In this scenario, the performance of the MDX queries may be very slow.

If you use SQL Server Profiler to trace this issue, you find that most of the event data for the MDX queries contains the 2 - Non-cache data value in the EventSubclass column instead of the 1 - Cache data value in the EventSubclass column.



CAUSE
This issue occurs because Analysis Services does not use the cache for the MDX queries.



RESOLUTION
The fix for this issue was first released in Cumulative Update 3. For more information about how to obtain this cumulative update package for SQL Server 2005 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:

939537 Cumulative update package 3 for SQL Server 2005 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 2005 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:

937137 The SQL Server 2005 builds that were released after SQL Server 2005 Service Pack 2 was released

Microsoft SQL Server 2005 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2005 Service Pack 2 hotfix to an installation of SQL Server 2005 Service Pack 2. By default, any hotfix that is provided in a SQL Server service pack is included in the next SQL Server service pack.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information about what files are changed, and for information about any prerequisites to apply the cumulative update package that contains the hotfix that is described in this Microsoft Knowledge Base article, click the following article number to view the article in the Microsoft Knowledge Base:

939537 Cumulative update package 3 for SQL Server 2005 Service Pack 2

