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  • GROUPBY vs SUMMARIZE in #dax #powerbi #powerpivot

    If you are using Power BI Desktop or Power Pivot in Excel 2016, you should learn when and how you can use GROUPBY instead of SUMMARIZE. The SUMMARIZE function is very powerful and internally very complex, so it’s easy to find scenarios where you get unexpected results or you have performance issues. The new GROUPBY function (also available in SSAS ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on February 15, 2016
  • Conferences and Training in Australia Feb/Mar 2016 #dax #sqlsaturday

    In a couple of weeks, I will move to Australia for 3 weeks, visiting Melbourne and Sydney for a number of events and training. This is the list of topics in public events you can attend (with link to registration pages – remember that SQL Saturday conferences are free events, but you still have to register first!): UPDATE 2016-02-08 - added a ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on January 31, 2016
  • Performance issues related to security roles in Analysis Services Tabular #ssas #tabular

    I have experienced (on difference customer’s databases) some performance issues related to security in SSAS Tabular models. The symptoms are that certain queries, pivot table, or reports, have good performance when you connect as a database administrator, but end users see bad performance no matter what selection and filter they use. I wrote an ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on January 13, 2016
  • The State of Power BI #powerbi

    The 2015 has been an amazing year for Power BI. One year ago, I was commenting on this blog the public preview of Power BI dashboards. A few days ago, Microsoft released the December update of Power BI Desktop and several updates of the Power BI service. In one year, we moved from a situation where Microsoft seemed (and actually was) too slow in ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on December 21, 2015
  • 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
  • PASS Summit 2015 and news about on-premises BI #ssas #tabular #sqlpass

    I don’t usually blog about news, unless there is a relevant impact on future directions. Last week we have seen a huge number of announcements for Power BI (Custom Visuals now available to anyone through a gallery online, you can import them in also in Power BI Desktop, and a number of improvements in Power BI Service and a new version of the ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on October 26, 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 www.daxpuzzle.com). 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
  • 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
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