FIX: Slow performance when you run MDX query in SSAS 2012 or SSAS 2014


When you use Microsoft SQL Server 2012 Analysis Services (SSAS 2012) or SQL Server 2014 Analysis Services (SSAS 2014), you may experience slow performance when you run a Multidimensional Expressions (MDX) query that meets the following conditions:
  • The query contains a dimension that has calculated members.
  • The calculated members aren't part of the query text.


This issue was first fixed in the following cumulative update for SQL Server:

Recommendation: Install the latest cumulative update for SQL Server

Note You can find information about the latest SQL Server builds from Where to find information about the latest SQL Server builds .

To enable this hotfix, you have to do the following configuration:
  • Open the Analysis Services configuration file msmdsrv.ini in <File Path>\Microsoft SQL Server\MSOLAP.nnnn\OLAP\Config.
  • If there's no AlwaysSetOrSliceAndNormalize property in the msmdsrv.ini file, add it to the ConfigurationSettings\OLAP\Query tree as follow:
  • Save the msmdsrv.ini file.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Article ID: 3123485 - Last Review: 31 May 2016 - Revision: 1