Writing measures referencing other measures is in general a good idea that simplifies the DAX code, but you might face specific bottlenecks. This article describes which performance issues might arise when different measures aggregate the same column using different filter…  Read more

A filter argument in CALCULATE is always an iterator. Finding the right granularity for it is important to control the result and the performance. This article describes the options available to create complex filters in DAX.  Read more

The new DAX available in Excel 2016 and the data model in Power BI and Analysis Services 2016 offer tools to manage many-to-many relationships in a more efficient way than previous version, as described in this article.  Read more

DAX introduced a GROUPBY function that should replace SUMMARIZE in some scenarios. This article describes how to use GROUPBY in nested grouping scenarios and other improvements.  Read more

This article explains how to create a calculated column in DAX to get a sequential number identifying the events related to a particular entity.  Read more

This article describes the semantic difference between ALLEXCEPT and the joint use of ALL and VALUES, showing practical examples of the different results in Power BI and SSAS 2016.  Read more

You can create static tables in DAX using the DATATABLE function. This article describes the syntax of this new feature and shows when and how to use it.  Read more

Applying security roles to a Power BI model or to an SSAS Tabular database might impact query performance. This article describes existing issues and possible workarounds. This is an advanced article, a good knowledge of storage engine and formula engine…  Read more

This article describes how DAX Studio can analyze the SQL queries sent to a relational database by Power BI or Analysis Services Tabular in DirectQuery mode.  Read more

This article analyzes how to efficiently work with events that lasts over time, such as the duration of an order considering the distance between order date and ship date.  Read more