A Poll With Step service event type references a step definition that is run by the Agentry Server periodically to actively poll the source back end system for data changes. This step definition is commonly a SQL step, though this is not a requirement. The step polling the source back end must return the key property of the object for which the service event has been defined to indicate there is data to be updated to the destination back end system. When the step returns this value, the service event’s read, data state, and update steps are processed.
This service event type is typically defined when the source back end is a SQL Database system connection, although any back end may be actively polled provided the correct step type definition is used. The only requirement of the step referenced by the service event to poll the source back end is that it return the key property for each object instance of the target object type to be synchronized.
This service event type includes the poll interval, which is the duration of time between polls of the source back end by the service event. The number of objects retrieved from the source back end can be limited to a maximum number of instances per poll interval.