There are periods of time when transaction performance is critical for a particular application, and there are other times, perhaps during the night, when performance is less critical.
You can define a single workload to monitor only during an application’s critical time period, or you can define multiple workloads for the application, with different monitoring periods and response time goals.
All workloads that belong to the same composite workload should have identical monitoring periods. If they have different monitoring periods, views that show combined workload performance might display misleading information.