What does the term ‘worker’ refer to in the context of SAP HANA scale-out architecture?

In the context of SAP HANA scale-out architecture, the term 'worker' specifically refers to a host that executes queries. Scale-out architecture in SAP HANA allows for multiple servers or hosts to work together to distribute processing loads, enhancing performance and scalability. Each worker node is responsible for executing queries and processing data, which means that as more worker nodes are added, the system can handle greater workloads and more complex queries efficiently. This design is critical in environments requiring high availability and performance, as each worker contributes to the overall processing capabilities of the system, allowing for optimized data handling and analytics.

The other options represent roles or components that do not align with the direct responsibility of executing queries within the SAP HANA scale-out context. For instance, user interface components serve different purposes, focusing on interaction rather than query execution, while administrative roles and backup servers have distinct functions unrelated to the immediate processing of data and queries in the worker context.