Topic: BISM

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Order of Evaluation in CALCULATE Parameters

DAX is the new language used by PowerPivot and Analysis Services in Tabular mode and it resembles the syntax of Excel formula and it can be considered a functional language. You do not have iterative statements, but you can run…  Read more

blog post –

Distinct Count of Customers in a SCD Type 2 in #DAX

If you have a Slowly Changing Dimension (SCD) Type 2 for your customer and you want to calculate the number of distinct customers that bought a product, you cannot use the simple formula: Customers := DISTINCTCOUNT( FactTable[Customer Id] ) ) because  Read more

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Clever Hierarchy Handling in DAX

Hierarchy handling in DAX is not very easy, due to the fact that hierarchies, unlike it was in MDX, are not first-class citizens in the DAX world. While hierarchies can be easily defined in the data model, there are no…  Read more

blog post –

Investigating on xVelocity (VertiPaq) column size

  In January I published an article about how to optimize high cardinality columns in VertiPaq . In the meantime, VertiPaq has been rebranded to xVelocity: the official name is now “xVelocity in-memory analytics engine (VertiPaq)” but using xVelocity  Read more

blog post –

Why to use #Tabular in Analysis Services 2012 #ssas

A few months ago I gave a speech at SQLBits 9 comparing Vertipaq vs. OLAP (you can watch session recording here ), which I repeated a few times in other conferences and webcasts. The title was intentionally provocative but it contained an explanation  Read more

blog post –

Create a #dax Measure in a Session in #BISM #Tabular

Thanks to Greg Galloway that pointed me out this is possible, in this post I want to show how to create a measure local to a session. This could be done in SQL Server Management Studio, even if it is probably not so useful for a Tabular model considering  Read more