What are Lineage and Impact Analysis Diagrams?
Lineage and Impact Analysis (LIA) diagrams show the relationships among objects managed by Warehouse Builder. These relationships are constructed by mappings and process flows. The lineage diagram for a particular object shows its source objects, and the impact diagram shows its targets. Lineage and impact are mirror images of each other. If Object A is part of the lineage diagram of Object B, then Object B is part of the impact diagram of Object A. When you read a diagram from left to right, you are seeing impact. When you read it from right to left, you are seeing lineage. For example, you might have a mapping that extracts data from a file and loads it into a table by way of an external table.
