Microsoft KB Archive/936254

= FIX: An MDX query may be slow if it reads from an aggregation that has less than 4,096 records in SQL Server 2005 Analysis Services =

Article ID: 936254

Article Last Modified on 11/4/2007

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APPLIES TO


 * Microsoft SQL Server 2005 Analysis Services

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Bug #: 50000890 (SQL Hotfix)



Notice
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
In SQL Server 2005 Analysis Services, a Multidimensional Expressions (MDX) query reads from an aggregation that has less than 4,096 records. In this case, the query may be slow.

Additionally, if you use SQL Server Profile to trace the execution of the query, you notice that the query does not read only from the partition that contains the data that is requested. Instead, the query scans all the partitions.



CAUSE
This problem occurs because a slice is created when SQL Server 2005 Analysis Services creates an index. For an aggregation that has less than 4,096 records, no index is created. Therefore, no slice is created. This situation causes all partitions to be scanned.



Cumulative update information
To resolve this problem, obtain cumulative update package 2 for SQL Server 2005 Service Pack 2 (build 3175). For more information about how to obtain cumulative update package 2 (build 3175), click the following article number to view the article in the Microsoft Knowledge Base:

936305 Cumulative update package 2 for SQL Server 2005 Service Pack 2 is available

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
 SQL Server 2005 Service Pack 2

For more information about how to obtain SQL Server 2005 Service Pack 2, 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



Restart information
You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix is not replaced by any other hotfixes.

Registry information
You do not have to change the registry.

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, Itanium architecture version


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 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

Keywords: kbsql2005as kbexpertiseadvanced kbfix kbpubtypekc kbqfe kbhotfixserver KB936254

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