FIX: The SQL Server 2005 Analysis Services service stops intermittently when you run an MDX query

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Article ID: 950993 - View products that this article applies to.
Bug: #50002435 (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.
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SYMPTOMS

When you run a Multidimensional Expressions (MDX) query in Microsoft SQL Server 2005 Analysis Services (SSAS), a heap corruption occurs. Additionally, the SSAS service stops intermittently. And, one or more minidump files are generated in the Analysis Services log folder.

CAUSE

This issue occurs because Analysis Services generates a mismatch that results in memory. When Analysis Services evaluates a calculation, Analysis Services builds a dimension query as a part of the evaluation. A set that is built for the dimension query uses an incorrect ordering of hierarchies.

RESOLUTION

The fix for this issue was first released in Cumulative Update 7. 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:
949095 Cumulative update package 7 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 "Applies to" section.

MORE INFORMATION

Critical information for SQL Server 2005 Analysis Services

A known issue in Cumulative Update 7 for SQL Server 2005 Analysis Services

Consider the following scenario. You install Cumulative Update 7 for SQL Server 2005 Service Pack 2 (SP2). In SQL Server Profiler, you start or stop a trace. You run a query whose execution time exceeds the value in the ForceCommitTimeout server setting. In this scenario, all the running queries on the server are cancelled.

To work around this issue, do not execute MDX queries before you start or stop a trace.

By default, the heap setting for Analysis Services is as follows.
<MemoryHeapType>1</MemoryHeapType>
<HeapTypeForObjects>1</HeapTypeForObjects>
If you force Analysis Services to use Windows Heap, this issue still occurs. However, the number of access violations decreases.

To force Analysis Services to use Windows Heap, modify the MemoryHeapType option and the HeapTypeForObjects option in the Msmdsrv.ini file, as follows.
<MemoryHeapType>2</MemoryHeapType>
<HeapTypeForObjects>0</HeapTypeForObjects>
Note The Msmdsrv.ini file is in the following folder:
SQL Server 2005 Analysis Services installation directory\OLAP\Config
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:
949095 Cumulative update package 7 for SQL Server 2005 Service Pack 2

REFERENCES

For more information about the list of builds that are available after SQL Server Service Pack 2, 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
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 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
For more information about the new features and the improvements in SQL Server 2005 Service Pack 2, visit the following Microsoft Web site:
http://go.microsoft.com/fwlink/?LinkId=71711
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: 950993 - Last Review: April 15, 2008 - Revision: 1.2
APPLIES TO
  • Microsoft SQL Server 2005 Analysis Services
Keywords: 
kbsql2005as kbhotfixrollup kbfix kbpubtypekc kbqfe kbexpertiseadvanced KB950993

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