PowerExchange generates an extraction map when you create a capture registration. You can edit the generated extraction maps to add or remove columns. You can also create additional extraction maps for a capture registration, each for a subset of the columns that are registered for capture. In the PowerExchange Navigator, extraction maps are listed under the extraction group for the database instance and node location from which the data is extracted.

To define a data source in PowerCenter, you can import the extraction map. When you run a CDC session, PowerExchange uses the source definition for extracting change data.