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  • Announcements at PASS Summit 2015: #SSAS CTP3 and more #sqlpass #summit15

    I’m sitting at the bloggers table at the Day 1 keynote of PASS Summit 2015 and I try to recap the important news for the BI community. SQL Server Analysis Services 2016 CTP 3 will be available in a few days here, but Microsoft already announced the news in this release: Previously announced news (most of them already described in this ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on October 28, 2015
  • Hardware and Virtualization Settings for Analysis Services Tabular #ssas #tabular

    If you use Analysis Services Tabular, you should dedicate a good amount of time in hardware selection. Unfortunately, throwing money in expensive hardware configuration could be a very bad idea, resulting in your 1,500$ desktop running faster than your expensive 100,000$ server. Moreover, if you use virtualization you have to be very careful in ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on October 22, 2015
  • Challenge your #dax skills with DAX Puzzle #powerbi #powerpivot

    Last week we launched a new page in SQLBI website: DAX Puzzle (you can also use The idea is very simple: we describe a scenario, we ask to solve a problem in that scenario and we might provide some hint to help you finding the solution. You can download a sample file (in Power BI Desktop, which is freely available to anyone – ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on October 21, 2015
  • The Definitive Guide to DAX is now available! #dax #powerpivot #powerbi #ssas #tabular

    I am so happy to announce that The Definitive Guide to DAX is finally available! I and Alberto Ferrari spent one year writing this book, and several years collecting the knowledge necessary to do that. The complete title is The Definitive Guide to DAX: Business intelligence with Microsoft Excel, SQL Server Analysis Services, and Power BI. You can ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on October 20, 2015
  • 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
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