Microsoft KB Archive/915795

= FIX: An MDX query against a measure group takes much longer than you expect to run, and SQL Server 2005 Analysis Services incorrectly reads data from the partitions instead of from the aggregations =

Article ID: 915795

Article Last Modified on 11/4/2007

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APPLIES TO


 * Microsoft SQL Server 2005 Analysis Services

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BUG #: 445 (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.



SUMMARY
This article describes the following about this hotfix release:
 * The issues that are fixed by the hotfix package
 * The prerequisites for installing the hotfix package
 * Whether you must restart the computer after you install the hotfix package
 * Whether the hotfix package is replaced by any other hotfix package
 * Whether you must make any registry changes
 * The files that are contained in the hotfix package



SYMPTOMS
When you run a Multidimensional Expressions (MDX) query against a measure group in Microsoft SQL Server 2005 Analysis Services, you experience the following symptoms:
 * The MDX query takes much longer than you expect to run. For example, a query that you expect to take approximately 12 seconds to run may take approximately 4 minutes to run.
 * If you run a SQL Server Profiler trace to trace the query execution, you determine that Analysis Services incorrectly reads data from the partitions instead of from the aggregations.

This problem occurs if the following conditions are true:  You run a Process Incremental operation on one or more of the partitions in the measure group that you query.  You run an MDX query that resembles the following. select filter([Measures].members, [Measures].currentmember.member_caption = [Measures].currentmember.member_caption) on columns from [Adventure Works] 

Note If you run a Process Index operation on the partitions on which you ran the Process Incremental operation, this problem does not occur.



CAUSE
This problem occurs because of a code problem in Analysis Services. A dimension may have lazy processing enabled. This is when the ProcessingMode property is set to the LazyAggregations value. Additionally, the AttributeRelationship value of this dimension may have the RelationshipType property set to the Flexible value. If you run a Process Update operation on this dimension without also running a Process Index operation, Analysis Services drops the flexible aggregations. Additionally, Analysis Services does not rebuild the aggregations.



Service pack information
To resolve this problem, obtain the latest service pack for SQL Server 2005. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

913089 How to obtain the latest service pack for SQL Server 2005

Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
To apply this hotfix, you must have Analysis Services installed on the computer.

Restart information
You do not have to restart the computer after you apply this hotfix. However, the Analysis Services service automatically stops and then restarts when you apply this hotfix.

If the computer on which you apply this hotfix is configured for HTTP access, you must stop Microsoft Internet Information Services (IIS) before you apply this hotfix. Then, you must restart IIS after you apply this hotfix.

If Analysis Services is installed as a named instance, you must stop the SQL Server Browser service when you apply this hotfix. You must stop this service because this hotfix updates the Msmdredir.dll component of the SQL Server Browser service.

Registry information
You do not have to change the registry.

Hotfix file information
This hotfix contains only those files that are required to correct the issues that this article lists. This hotfix may not contain all the files that you must have to fully update a product to the latest build.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

SQL Server 2005, 64-bit IA-64 versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in SQL Server 2005 Service Pack 1.



MORE INFORMATION
For more information, 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

Keywords: kbsql2005presp1fix kbhotfixserver kbqfe kbpubtypekc KB915795

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