In Power BI, a gateway serves as a bridge between Power BI services (such as Power BI Online) and on-premises data sources. Here are some of the primary uses of a gateway in Power BI Services:
1. Accessing On-Premises Data Sources: The primary use of a gateway is to enable Power BI to access data stored in on-premises data sources such as SQL Server databases, Analysis Services cubes, Oracle databases, SharePoint lists, and more. Without a gateway, Power BI Online wouldn't be able to connect directly to these on-premises data sources.
2. Data Refresh: Gateways allow scheduled data refreshes for datasets stored in Power BI Service that are based on on-premises data sources. This means that Power BI can regularly update its data with the latest information from on-premises databases, ensuring that reports and dashboards in Power BI Service always reflect up-to-date data.
3. DirectQuery and Live Connection: Gateways are essential for enabling DirectQuery and Live Connection modes in Power BI reports. DirectQuery allows Power BI to query data directly from on-premises data sources in real-time, while Live Connection enables reports to connect to on-premises Analysis Services cubes or Power BI Report Server instances.
4. Personal and Organizational Gateways: Power BI supports two types of gateways: Personal and On-premises data gateway (standard). Personal Gateways are designed for individual use and are used to connect Power BI Desktop to on-premises data sources during report development. On-premises data gateways (standard) are used in production environments to connect Power BI Service to on-premises data sources and enable data refresh.
5. High Availability and Scalability: Gateways support high availability and scalability features to ensure continuous access to on-premises data sources. You can configure multiple gateways in a high availability mode to provide redundancy and failover capabilities, ensuring uninterrupted access to data sources even in the event of a gateway failure.
6. Data Security: Gateways support data encryption and authentication mechanisms to ensure secure communication between Power BI Service and on-premises data sources. You can configure data source credentials and encryption settings within the gateway to maintain data security and compliance with organizational policies.
Overall, gateways play a crucial role in enabling Power BI to securely access and refresh data from on-premises data sources, thereby facilitating real-time reporting and analysis in Power BI Service.
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