Data modelling and DAX
Introduction: Around 2014, an enhancement was made to the DAX engine designed to help improve query speed. The enhancement, called DAX Fusion, looks to reduce the number of storage engine scans needed to satisfy queries, by combining similar scans where possible. This optimisation feature exists in Power BI, so can be used to help speed … Continue reading DAX Fusion
The Tip: Convert calculated columns in your model to physical columns (where practical). The Detail If you encounter memory issues when processing partitions in an Analysis Services (AS) database, one option you might consider to resolve this is to convert calculated columns in the offending tables to physical columns. When processing partitions, the AS engine … Continue reading Analysis Services Memory Tip (processing partitions)
This is not so much a DAX tip, rather something you might consider if you want to speed up the performance of any Direct Query (DQ) model you manage in Power BI or Analysis Services. The simple tip is to set relationships to use INNER JOIN rather than LEFT OUTER JOIN in the model. Once … Continue reading Tip to speed up Direct Query
Did you know, in some cases, it is possible to add columns to your model to speed up the DAX used behind visuals to make them as much as 100 times faster? The PBIX helper file for this article can be downloaded here. I have come across this scenario a few times recently, so thought … Continue reading Speed up Power BI reports using columns