![]() A live connection is the second in the list, and DirectQuery is the last one, and the slowest one.Īlthough the performance of the Live Connection is usually better than the DirectQuery, however, I highly recommend performance tuning of the SSAS Model. Import Data is the fastest possible option regarding performance in Power BI. Live Connection, however, is not as fast as Import Data. However, depends on the network bandwidth, how calculations and model are implemented, it might change. Using live connection to SSAS tabular is usually faster because the data is stored in the memory of the machine that runs SSAS Tabular. ![]() In general, because Live connection connects to an analytical engine, then calculations and analytical results come faster than a query from the database. However, in every implementation, many factors affect the performance, and there are always exceptions. Live Connection can work faster than DirectQuery in many scenarios. However, because these queries run on an analytical engine, usually, you can expect faster results (this might be different depending on many factors). Like the DirectQuery mode, Power BI Desktop will send a query for every single visualization to the database. Here are queries posted to the database for above report DAX codes sent to the Analysis Services database You can run SQL Profiler on Analysis Services, to capture all DAX queries sent to the database. Live Connection enabled How Live Connection Works behind the scene?Ĭonsider that we have a Power BI report like the screenshot below Sample Power BI report You can see on the right bottom side of Power BI Desktop that it is mentioned Live Connection. And the model includes multiple tables, with their relationships, hierarchies, and calculations will be connected to Power BI. Note that you just choose a model, not tables. ![]() In the Navigator window, then you can select the Adventure Works Internet Sales model. For your machine, the set up might be different. The SSAS installed on my machine is in the tabular instance name, that is why I put the server name as “.\tabular”. When connecting to SQL Server Analysis Services database, you can choose “Connect live” Connect Live to Analysis Services Open a Power BI Desktop, and go through Get Data, from Analysis Services. In this post, we are not going into details of how to set up or install SQL Server, or SSAS tabular model. The database can be accessed and downloaded from here: You can download the SQL Server trial 180 days edition from this link: Īfter installing SSAS Tabular instance, then you can restore AdventureWorks Tabular model on it. To create a Live Connection example, you need to have the SQL Server Analysis Services Tabular model installed. How to create a report with Live Connection However, the SSAS technology can be cloud-based (Azure Analysis Services), or on-premises (SSAS on-premises). You cannot have a Live connection to the SQL Server database engine itself. These four types are SQL Server Analysis Services (SSAS) technology. SQL Server Analysis Services Multi-Dimensional.The only four types of data sources supported by this type of connection are: Data will be kept in the data source, and visualizations will query the data source every time from Power BI. This type of connection does not store a second copy of the data in the memory. Live Connection is a type of connection only to three types of data sources. ![]() In this post, you’ll learn the details of this type of connection, things that you need to consider, and how to set it up working with a gateway. With this method, you get benefits of both worlds large-scale model size, and the analytical power of Analysis Services. However, it is different from DirectQuery, because it will give you the analytical engine of SQL Server Analysis Services Tabular. ![]() This type of connection is somehow similar to DirectQuery because it won’t store data in memory. Live Connection is another type of connection in Power BI. ![]()
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