Category Archives: BISM Tabular

How To Implement a Composite Key In SSAS Tabular Model

As you might know SSAS tabular models do not support composite keys so you always must have just one column to make a unique row through the whole table. This is such a pain especially when you are new to the tabular models and don’t have that much detail information about it. So when you import some tables with existing relationships based on composite keys, the Table Import Wizard will ignore those relationships.

So what should we do to solve the problem?

The solution is to combine the values of the composite keys. 

Here is how you can do the job?

·         Creating a view on top of the source tables:

1.  If you’re using SQL Server 2012 and above you can use the “concat” function to combine the values. The function combines several expressions regardless of their data types. So you can use it like this select CONCAT (1, 1.22100001,‘First’) SQL2012 and the result would be something like this

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2.  If you’re using earlier versions of SQL Server then you need to mind the data types. So for the above sample the SQL code would be select cast(1 as char(1)) + cast(1.22100001 as char(10))+‘First’ SQL2008 . As we expect the result is the same.

·         Adding a new computed column to all tables involved in SQL Server before importing the tables to the tabular model

·         Adding a new calculated column to all tables involved after importing the tables to the tabular model

As a quick note, you’ll need to remove the existing relationships imported from SQL Server and create the new relationship based on the combined keys.

Easy peasy!

Resolving “Object reference not set to an instance of an object.” Error When Deploying your Tabular Model

You’ve changed something in your Tabular model and you’re facing an ugly “Error: Object reference not set to an instance of an object.” message, don’t rush. Just go to the table you’ve made some changes and click on “Partitions” button.

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Then click “Refresh Preview” button and click OK.

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All done!

How to Automate SSAS Tabular Model Processing

You are working on a BI project that involves SSAS Tabular model. As you cannot process the model manually you need to develop a solution to process the model automatically. There are two scenarios here:

  1. You have an up and running SQL Server Integration Services (SSIS) instance: In this case you can build a SSIS package to process the Tabular Model.
  2. You do not have an SSIS instance ready on the server: So you need to create a SQL Server Agent Job.

In this post I’m expressing easy ways to solve the problem based on the above scenarios.

Using SQL Server Integration Services to Process SSAS Tabular Model

Follow the steps below:

  1. Create a new SSIS project using (SQL Server Data Tools) SSDT
  2. Right click on the “Connection Managers” area and select “New Analysis Services Connection”image

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