You need to select the appropriate mode for the Sales database. Which mode should you select?

ROLAP stores aggregations in relational tables and queries the relational engine, but it still requires a defined cube structure in SSAS and does not provide the live pass-through query behavior needed here.

Direct Query mode in SQL Server Analysis Services (SSAS) or Power BI does not import data into an in-memory cache - instead, every query is translated and forwarded live to the source database. This allows the Sales database to reflect real-time data changes and supports datasets too large to fit in memory. It is the correct choice when freshness and scale requirements prohibit a full data import.

MOLAP imports and pre-aggregates data into a multidimensional cube stored on disk, which means data is not real-time and imposes storage overhead unsuitable for a large Sales dataset requiring live access.

In-Memory (VertiPaq) mode imports the entire dataset into compressed in-memory storage, which is impractical for very large Sales databases where live query pass-through is required.