You are building a Power BI report that must query a table of about 300 million rows stored in Azure SQL Database. Business stakeholders insist that the data shown be no more than five minutes old during business hours, and scheduled dataset refreshes cannot exceed ten minutes. Which Power BI connection mode best meets these requirements while avoiding lengthy refresh operations?
DirectQuery leaves the data in the source system and issues queries at report run-time, so visuals always reflect the latest committed rows without performing a full dataset refresh. Import mode copies the entire dataset into Power BI; refreshing hundreds of millions of rows every five minutes would almost certainly exceed the ten-minute window and place heavy load on the gateway and model memory. A live connection is limited to Analysis Services models, not Azure SQL Database, and a composite model whose default storage is Import would still require frequent bulk refreshes to stay current. Therefore, DirectQuery is the most appropriate choice.
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