Which layer of SAP is primarily concerned with data storage?

The database layer is primarily responsible for data storage in the SAP architecture. This layer manages the actual data, which includes storing, retrieving, and manipulating the data that applications rely upon. It acts as a centralized repository where all persistent data is stored and allows for efficient access and management of that data for various applications running on top of it.

The database layer interacts with the application layer, which processes the data and provides business logic and functions. While the presentation layer provides the user interface, and the process layer handles the execution of business processes, the database layer is fundamentally focused on storing the data securely, ensuring its integrity, and providing efficient access to it for the application and process layers. This hierarchy is crucial in enabling the full functionality of SAP applications, supporting both operational and analytical processes effectively.