Chapter 6 Managing Models
All DBMSs stored in the installation directory are updated when you upgrade PowerDesigner.
For DBMSs copied to the model file in previous PowerDesigner versions, you will be invited to upgrade the DBMS when you open the old model.
When you open a PDM the following situations can occur:
| DBMS type | Matching DBMS | No match |
|---|---|---|
| Share | DBMS upgraded and message in the Output window | Keep DBMS from previous version |
| Copy | A confirmation dialog box lets you decide if you want to replace the DBMS, if you replace the DBMS, a message appears in the Modeling Output window | Keep DBMS from previous version |
If you had customized your DBMS, you can use the following methods to keep the changes in your definition file while switching to the current version:
Shared DBMS Merge the current version DBMS with DBMS from a previous version, using the merge feature available from the list of DBMS (Tools→Resources→DBMS).
Copied DBMS Create a new model using a current version DBMS fairly similar to your modified DBMS, and merge it with a model using the DBMS from a previous version.
In the merge dialog box, you should have the current version DBMS in the right pane and the modified DBMS in the left pane. You should be careful when you modify the current version DBMS: apply only the changes you remember, in case of changes in both DBMS versions, try to understand the differences and avoid modifying the current version DBMS.
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