Tasks
Tasks are used to perform a wide variety of operations and can be chained together in just any pattern. The tasks are handled by the Qlik Sense Scheduler Service (QSS). The following types of tasks are available:
- Reload
- Preload
- User synchronization
- External program
- Distribution
The reload task fully reloads the data in an app from the source. Any old data is discarded.
Preload tasks load apps into memory in advance so that they are ready to open instantly. This is useful when working with large apps.
A user synchronization task imports the users and the users' information from a user directory. When you create a new instance of a user directory connector (UDC) a synchronization task with a scheduled trigger is created by the system.
The external program task triggers a third-party program. The external program task cannot be edited, nor used for task chaining.
With distribution tasks, you can trigger distribution of apps from client-managed Qlik Sense to Qlik Cloud.
Triggers
Execution of a task is initiated by a trigger or manually from the tasks overview page. You can create additional triggers to execute the task, and there are two types of triggers:
- Scheduled
- Task event
Scheduled triggers can be applied to reload tasks, preload tasks, and user synchronization tasks. Task event triggers can only be applied to reload tasks and preload tasks.
The triggers for a reload task and preload tasks are available directly on the Task edit page.
The triggers for a user synchronization task are accessed from the Associated items tab on the Task edit page, where the Triggers overview lists all the available triggers for the selected task.