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Chapter 7 Generating a Physical Data Model from an Object-Oriented Model
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You must indicate the following parameters when you update an existing
PDM:
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
Preserve Modifications When selected, allows a comparison and merge of the
newly generated PDM (default PDM) with the existing
PDM
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.
Update existing
Physical Data
Model