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  • Fix performance issue of pivot tables with Tabular models

    If you use SSAS Tabular, this is a very important news! Microsoft released a very important update for Analysis Services 2012 that provides performance improvements to pivot tables connected to an Analysis Services Tabular model: it is SQL Server 2012 SP2 Cumulative Update 8. Microsoft discussed some of these improvements in this blog post: ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on September 22, 2015
  • Don’t ignore the Context Transition in #dax

    Almost 3 years ago I wrote an article with the rules for DAX code formatting. If you quickly look at the article, you might think that it is all about readability of the code, and this is fundamentally true. But there two rules that have a particular importance for performance, too: Never use table names for measures Always use table names ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on September 22, 2015
  • Back to the basic: #dax primers for new #powerbi users

    The growing adoption of Power BI Desktop is gathering new users of the DAX language. At the same time, there are a few new features, such as bidirectional filter propagation, that introduce new concepts to existing knowledge. For this reason, in the last weeks we published two articles describing important basic concepts and clarifying the ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on September 7, 2015
  • Large Dimensions in SSAS Tabular #ssas #vertipaq

    After many years of helping several companies around the world creating small and large data models using SQL Server Analysis Services Tabular, I’ve seen a common performance issue that is underestimated at design time. The VertiPaq engine in SSAS Tabular is amazingly fast, you can have billion of rows in a table and query performance are ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on August 20, 2015
  • The ALLSELECTED function under the cover #dax #tabular #powerpivot #powerbi

    I and Alberto Ferrari recently completed the writing of The Definitive Guide to DAX, and we spent months to correctly describe the internals of evaluation context in this language. There are many details that make data model working with both DAX and MDX, and sometime there are behaviors that are not intuitive to understand. A function that seems ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on August 5, 2015
  • VertiPaq Analyzer for Analysis Services #ssas #tabular #powerpivot #powerbi

    During the writing of The Definitive Guide to DAX I wanted a simple way to analyze the content and distribution of data compressed in the VertiPaq engine, used by Analysis Services Tabular, Power Pivot and Power BI models. I always relied on BISM Memory Report (thanks Kasper!), but when you focus on a single database there are a number of details ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on July 28, 2015
  • Optimize Heap Memory Settings for Analysis Services Tabular 2012/2014 #ssas #tabular

    In the last months I assisted many companies implementing solutions based on Analysis Services Tabular. There is not so much difference between the versions 2012 and 2014, because SQL Server 2014 didn’t introduce new features to the BI services. Thus, my considerations are valid for both. One issue observed in different cases was a general ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on June 2, 2015
  • New features in DAX Editor #dax #tabular #ssas

    In the last few weeks I and Teo Lachev took the ownership of DAX Editor code. It is an add-in for Visual Studio that allows you to edit DAX measures in a text editor instead of using the Measure grid. It also provides other features (such as editing measures of an online Tabular database and performing a few queries). The user interface is not ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on April 7, 2015
  • DAX Studio 2.1 helps you optimizing #dax queries for #powerpivot #powerbi #ssas #tabular

    After the initial release of DAX Studio 2.0, in December 2014, I started working on a few features to analyze performance of DAX queries. Darren Gosbell implemented many other features, and Daniele Perilli helped us with the graphics of the UI. We certainly can do more, but I think that the current feature set of the new release is good enough to ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on March 17, 2015
  • Use FIRSTNONBLANK and LASTNONBLANK instead of MIN and MAX #dax

    You are probably used to think to FIRSTNONBLANK and LASTNONBLANK as DAX functions related to time-intelligence calculations (usually for semi-additive measures). However, these functions have a syntax and a behavior that can be useful in other scenarios. For example: you might be aware that MIN and MAX cannot be used with text columns. However, ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on February 24, 2015
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