When the source data lacks integrity, it's recommended that an "unknown" dimension record is added to effectively repair the data. They'll allow configuring more efficient model relationships that expect matched values on both sides of relationships. It's also important that fact-type dimension columns contain valid dimension key values. However, best optimization results are often achieved by applying optimizations to the source database.Įnsure data integrity is complete: It's especially important that dimension-type tables contain a column of unique values (dimension key) that maps to the fact-type table(s). While it is the preferred layer to prepare the data for a DirectQuery model, some optimizations can also be achieved in the model design, without modifying the source database. We understand that not all modelers have the permissions or skills to optimize a relational database. The relational database source can be optimized in several ways, as described in the following bulleted list. Often, optimizations need to be applied directly to the data source to achieve good performance results. It can also involve data architects, and data warehouse and ETL developers. The team usually consists of model developers and the source database administrators. We often see that a successful DirectQuery model deployment is the result of a team of IT professionals working closely together. If you determine that DirectQuery is the appropriate design approach, we recommend that you engage the right people on the project. It's important to understand that DirectQuery models impose a different workload on the Power BI environment (Power BI service or Power BI Report Server) and also on the underlying data sources. For more information, see Use composite models in Power BI Desktop. However, the implications of combining Import tables with DirectQuery tables aren't in scope for this article. The guidance described in this article is still relevant-at least in part-to Composite model design. A Composite model consists of at least one DirectQuery source, and possibly more. This article doesn't directly cover composite models. For considerations when using DirectQuery storage mode for Dataverse, see Power BI modeling guidance for Power Platform.
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