Dataset refresh requirements vary depending on the storage mode/dataset type. Datasets in push mode don't access any data sources directly but expect you to push the data into Power BI. DirectQuery datasets and datasets in LiveConnect mode to Analysis Services don't import data they query the underlying data source with every user interaction. They require refresh because only this type of dataset imports data from its data sources, and the imported data might be updated on a regular or ad-hoc basis. The most significant point is that only Import mode datasets require a source data refresh. The following diagram illustrates the different data flows, based on storage mode. For more information, see Storage mode in Power BI Desktop. And combining these details with storage mode specifics helps to understand what exactly Power BI performs when you select Refresh now for a dataset.Ī Power BI dataset can operate in one of the following modes to access data from various data sources. Power BI refresh types: Regardless of dataset specifics, knowing the various refresh types can help you understand where Power BI might spend its time during a refresh operation.You can choose between reimporting data into Power BI to see any changes that occurred or querying the data directly at the source. Storage modes and dataset types: The storage modes and dataset types that Power BI supports have different refresh requirements.To understand how Power BI refreshes your datasets, reports, and dashboards, you must be aware of the following concepts: The entire process consists of multiple phases, depending on the storage modes of your datasets, as explained in the following sections. Whenever you refresh data, Power BI must query the underlying data sources, possibly load the source data into a dataset, and then update any visualizations in your reports or dashboards that rely on the updated dataset. Understanding data refreshĮmbed Power BI content with service principal and an application secret For targeted step-by-step instructions to configure data refresh, refer to the tutorials and how-to guides listed in the Next steps section at the end of this article. The content lays a foundation to help you understand how data refresh works. It also provides best practices and tips to avoid common refresh issues. This article describes the data refresh features of Power BI and their dependencies at a conceptual level. Knowing how to refresh the data is often critical in delivering accurate results. Power BI enables you to go from data to insight to action quickly, yet you must make sure the data in your Power BI reports and dashboards is recent.
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