
Chapter 7 Generating a Physical Data Model from an
Update existing | You must indicate the following parameters when you update an existing |
Physical Data | PDM: |
Model |
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Parameter
Description
Select Model
Target Physical Data Model. This is the existing PDM that the newly generated PDM (source model) is merged with to create an updated PDM
DBMS | Current Database Management System definition |
| (DBMS) for the existing PDM |
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Preserve Modifications | When selected, allows a comparison and merge of the |
| newly generated PDM (default PDM) with the existing |
| PDM |
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Clearing the Preserve Modifications checkbox
When Preserve modifications is not selected, PowerDesigner automatically replaces the selected target model (existing PDM) with the newly generated PDM. If you want to choose which objects to add or delete from the target model, you must select Preserve Modifications to compare and merge the two PDM.