When you run a query on an Analysis Services cube that
contains virtual dimensions, you may notice that the performance of the query
degrades temporarily after the virtual dimensions are processed by using the
incremental update processing.
This problem occurs if the version of SQL Server 2000 Analysis Services that
is installed on your computer is 8.0.931 or later.
By default, virtual dimensions are changing dimensions. When a changing dimension that is used in an Analysis Services cube is processed, a lazy aggregation processing operation is triggered on a low-priority background thread.
After you install the 8.0.931 build version of SQL Server 2000 Analysis Services, when the virtual dimensions are processed by using the incremental update processing method, the lazy aggregation processing is triggered. During the lazy aggregation, the flexible aggregations and indexes for the Analysis Services cube that uses the changing dimensions are deleted and re-created. Therefore, the query performance may noticeably decrease until the lazy aggregation processing is complete.Note
Before hotfix build 8.0.931, when the virtual dimensions are processed by using the incremental update processing method, the lazy aggregation processing operation is not triggered.
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
How to obtain the latest SQL Server 2000 service pack
The English version of this hotfix has the file attributes (or later) 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 tool in Control Panel.
Date Time Version Size File name
06-Apr-2004 07:56 18,800 Msmd.h
09-Jun-2004 05:04 8.0.950.0 221,760 Msmdcb80.dll
09-Jun-2004 05:04 18.104.22.1680 4,063,808 Msmddo80.dll
09-Jun-2004 05:04 8.0.950.0 1,032,768 Msmdgd80.dll
09-Jun-2004 05:04 8.0.950.0 172,608 Msmdpump.dll
09-Jun-2004 04:09 8.0.950.0 446,524 Msmdsgn.rll
09-Jun-2004 05:04 22.214.171.1240 9,642,564 Msmdsgn80.dll
09-Jun-2004 05:04 8.0.950.0 1,839,684 Msmdsrv.exe
09-Jun-2004 05:04 8.0.950.0 2,081,360 Msolap80.dll
09-Jun-2004 03:55 8.0.950.0 213,068 Msolap80.rll
Because of file dependencies, the most recent hotfix that
contains these files may also contain additional files.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.
This update to Analysis Services introduces the
prioritization of indexing of partitions in a cube during lazy processing. The introduction of this prioritization improves the efficiency of lazy processing. To prioritize the indexing of partitions in a cube during lazy
processing, the Analysis Services program uses the value of the Description
property of partitions. The Description
property of a partition has the following characteristics:
- The value of the Description property is a string that is
considered as case insensitive.
- By default, the Description property is not set for a
partition. Therefore, to assign the priority, you must modify the value of the
Description property of the partition.
- The value of the Description property is sorted based on
the lexicographic order. The partition that has the highest value for the
Description property is processed first. For example, if you have two
partitions, P1 and P2, and you assign the value of the Description property for
P1 as 001 and you assign the value of the Description property for P2 as 002, the Analysis
Services program will process the partition P2 first.
- If two partitions have same value for the Description
property, the order among the conflicting partitions is decided by the
Analysis Services program.
- If the Description property is not set for a partition,
the partition is processed after all other partitions that have
the Description property set have been processed.
following code sample can be used to assign a value to the Description
of a partition.Notes
- This code sample uses the syntax of the Microsoft Visual Basic 6.0
programming language and sets the Description property value of the partition HR in the cube HR of the sample database FoodMart 2000 to "001".
- Before you run this code sample, you must replace
AnalysisServer with the name of your Analysis Server.
- Before you run this code sample, you must add a reference
to the Microsoft Decision Support Objects library.
Dim s As New DSO.Server
'Connect to the Analysis Server.
'Instantiate the data source.
Dim database As MDStore
Set database = s.MDStores("Foodmart 2000")
'Instantiate the cube.
Dim cube As MDStore
Set cube = database.MDStores("HR")
'Instantiate the partition.
Dim partition As MDStore
Set partition = cube.MDStores("HR")
'Set the Description property value of the partition.
partition.Description = "001"
'Update the partition.
For additional information about a related problem, click the following article number to view the article in the Microsoft Knowledge Base:
FIX: The Analysis server computer stops responding when you process dimensions and virtual dimensions
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
Description of the standard terminology that is used to describe Microsoft software updates