Microsoft KB Archive/817297

= FIX: EstimatedRows Property of Aggregation is Set to Zero for Aggregations That Have Several Dimension Members Cubes with Many Leaf Dimension Members =

Article ID: 817297

Article Last Modified on 11/21/2006

-

APPLIES TO


 * Microsoft SQL Server 2000 Analysis Services
 * Microsoft SQL Server 2000 Service Pack 1
 * Microsoft SQL Server 2000 Analysis Services
 * Microsoft SQL Server 2000 Analysis Services

-



BUG #: 13954 (Plato7x)



SYMPTOMS
Analysis Services may set the EstimatedRows property for a particular aggregation in a partition to zero, if the number of dimension members in a cube is large. The EstimatedRows property is used by the Aggregation Design Wizard when it evaluates aggregations for use in the cube. Because the EstimatedRows size is zero for these aggregations, they may be selected for use in the cube even though the size of the aggregation is quite large and other aggregations may be more appropriate.



MORE INFORMATION
Analysis Services uses a formula to estimate the number of rows that will be required for an aggregation at selected levels of the dimensions in a cube. The estimate is stored in the EstimatedRows property of the Aggregation object in Microsoft Decision Support Objects (DSO). One step in the formula uses the product of the dimension member counts, at the selected level of each dimension, as the denominator in a division operation. In cases where there are many members at the selected levels of the dimensions, the result of the division operation is rounded to zero. As a result, the formula for the EstimatedRows property returns zero. With this fix, the EstimatedRows property for such aggregations is set to the value of the fact table size for the cube or partition. This prevents the aggregation from incorrectly being selected for use.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft SQL Server 2000 Analysis Services service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

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

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English version of this fix 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 --  28-Mar-2003  00:27  8.0.772.0    217,668 bytes  Msmdcb80.dll 28-Mar-2003 00:27  8.0.0.795  4,055,616 bytes  Msmddo80.dll 28-Mar-2003 00:27  8.0.767.0  1,024,576 bytes  Msmdgd80.dll 28-Mar-2003 00:27  8.0.0.761  9,638,464 bytes  Msmdsgn80.dll 07-Mar-2003 21:09  8.0.783.0  1,831,492 bytes  Msmdsrv.exe 28-Mar-2003 00:27  8.0.792.0  2,073,168 bytes  Msolap80.dll Note: Because of file dependencies, the most recent hotfix or feature that contains the files may also contain additional files.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Additional query words: OLAP Performance, olapsp3hotfix

Keywords: kbbug kbfix kbqfe kbhotfixserver KB817297

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.