In Power BI, the storage mode refers to how data is stored and managed within the Power BI service. There are primarily three storage modes in Power BI:
Import Mode: In import mode, data is imported into the Power BI dataset. The entire dataset, including the data, is stored within the Power BI service. This mode is suitable for scenarios where the dataset size is manageable and where the data doesn't frequently change. It offers fast performance for analysis and visualization since data is stored locally within Power BI.
DirectQuery Mode: In DirectQuery mode, Power BI queries the data directly from the underlying data source in real-time. Unlike import mode, data isn't stored within the Power BI service; instead, Power BI sends queries to the data source whenever a report or visualization is rendered. This mode is useful when dealing with large datasets or when you need to access real-time data. However, it may lead to slower performance compared to import mode, especially for complex queries or large datasets.
Live Connection Mode: Live connection mode is similar to DirectQuery mode, but it's specifically used for connecting to Analysis Services tabular models hosted on-premises or in the Azure Analysis Services. With live connection mode, Power BI connects directly to the tabular model, and queries are executed against the model in real-time. This mode is suitable for scenarios where you need to leverage existing investments in Analysis Services or where you require real-time access to data.
Each storage mode has its advantages and considerations, and the choice between them depends on factors such as data size, frequency of data updates, performance requirements, and data source capabilities. Power BI allows users to select the appropriate storage mode based on their specific needs when creating or configuring datasets.
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