During the refresh, a copy of the dataset is kept to handle queries to the dataset. The amount of memory required to refresh a dataset depends on whether you're performing a full or partial refresh. In addition, advanced users can use the XMLA endpoint to refresh specific partitions in any dataset. In these datasets, only a subset of the table partitions are refreshed. Partial refresh will take place in datasets that have tables with an incremental refresh policy. When a dataset is refreshed, it's either fully refreshed or partially refreshed. Because Power BI copies the data, you must refresh the dataset to fetch changes from the underlying data sources. You might consider such a dataset a point-in-time copy. Power BI report and dashboard queries submitted to the dataset return results from the imported tables and columns. Power BI imports the data from the original data sources into the dataset. 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.
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