Change function inputs and outputs

• DEDB area data sets

• Image copies of the DEDB areas

The input source to select for the change function depends on the available resources of your specific processing environment. Using an area data set as input requires enough available DASD to store input and output versions of the area. Using an image copy as input eliminates the need for duplicate DASD but requires the use of cache storage and a tape drive.

As shown in figure below, the change function processes input from an area data set or an image copy data set. The change function processes outputs to a new area data set and can create an output image copy of the changed area data set.

During DEDB restructuring, the Fast Path Reorg/EP change function initializes the new DEDB automatically. This initialization saves job steps and further conserves DEDB maintenance resources.

The change function generates a summary report to the report log when DEDB change activities are complete. For an example of the Area Change Report, see the PFPCHNG member in the REPORTS data set.