FIX: The queries run very slowly when you run MDX queries in an application that uses the ADOMD.NET data provider through HTTP to connect to SQL Server 2008 Analysis Services

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Article ID: 972763 - View products that this article applies to.
Microsoft distributes Microsoft SQL Server 2008 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 fix release.
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SYMPTOMS

Consider the following scenario:
  • You have an application that uses the ADOMD.NET data provider through HTTP to connect to Microsoft SQL Server 2008 Analysis Services.
  • In the application, you run some Multidimensional Expressions (MDX) queries.
In this scenario, you may find that the MDX queries run very slowly.

Note If you use the OLE DB provider through HTTP, the OLE DB provider through TCP/IP, or the ADOMD.NET data provider through TCP/IP, the MDX queries run much faster.

CAUSE

In the applications that use other data providers, the keep-alive message is sent multiple times. However, when the application uses the ADOMD.NET data provider through HTTP, there is only one keep-alive message that is sent. Therefore, each request is sent for authentication repeatedly. This causes the performance issue that is mentioned in the "Symptoms" section.

RESOLUTION

The fix for this issue was first released in Cumulative Update 3 for SQL Server 2008 Service Pack 1. For more information about this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:
971491 Cumulative update package 3 for SQL Server 2008 Service Pack 1
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 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:
970365 The SQL Server 2008 builds that were released after SQL Server 2008 Service Pack 1 was released
Microsoft SQL Server 2008 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2008 Service Pack 1 hotfix to an installation of SQL Server 2008 Service Pack 1. 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 "Applies to" section.

REFERENCES

For more information about the Incremental Servicing Model for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:
935897 An Incremental Servicing Model is available from the SQL Server team to deliver hotfixes for reported problems


For more information about the naming schema for SQL Server updates, click the following article number to view the article in the Microsoft Knowledge Base:
822499 New naming schema for Microsoft SQL Server software update packages


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: 972763 - Last Review: July 27, 2009 - Revision: 2.0
APPLIES TO
  • Microsoft SQL Server 2008 Analysis Services
Keywords: 
kbsurveynew kbexpertiseadvanced kbqfe kbfix KB972763

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