Using the Relation Output Operator Property Editor

See Also

The Relation Output operator sends out groups of tuples that reflect changes in the relation result. Whenever an event triggers a change in the relation result, the Relation Output operator sends out records with a tag on the end, which indicate a + or - (records added or deleted, respectively.)

If a change occurs as a result of the triggering event such that a record changes, the IEP sends a delete record matching the changed record.

The IEP feature sends an add record out when there is an updated or new version of that record. The operator only sends events when there are change events rather than repeatedly sending the entire result.

However, if a triggering event enters into the IEP process, but the result of the final relation from that event does not change,  the relation output is not triggered and the Relation Output operator does not send data.

To create a Relation Output operator:

  1. Drag a Relation Output operator from the Palette to the Design view.
  2. As needed, connect the input of the new Relation Output component to an operator that has Relation output.
  3. Double-click the Relation Output component. The property editor opens. Notice that the component has inherited the schema of its input relation.
  4. As needed, configure the following properties: Name and Include Timestamp. Select the Include Timestamp checkbox if you want to include a timestamp on the output from the Relation Output.
  5. (Optional) Click the Documentation tab and supply notes on this component.
  6. Click OK.
See Also
 
Using the Table Output Operator Property Editor
Using the Stream Output Operator Property Editor
 

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