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url: /statelake/scripting-reference/events/dataview-events-dataset.md
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# Dataview Events (Dataset)

## OnStartMap Event

This **Event** fires once each time the engine starts processing the dataset.

If the dataset has **Linked Data** it will only fire once at the start of the first record in the source dataset.

However, if the dataset is a child of another dataset, then the engine will start its processing multiple times - once for each record in the parent dataset. Therefore this **Event** will fire once each time the dataset starts.

## OnEndMap Event

This **Event** fires once each time the engine finishes processing the dataset.

If the dataset has **Linked Data** it will only fire once at the end of the last record in the source dataset. However if the dataset is a child of another dataset, then the engine will finish its processing multiple times - once for each record in the parent dataset. Therefore this **Event** will fire once each time the dataset ends.