You might want to back out multiple changes after they have been
deployed. You can use your library control system to undo those changes.
To back out multiple changes, complete the following steps:
- Extract the label or tag for your latest change.
- Use the Undo section of the Deployment Script Editor to roll back
your changes.
- Extract the next, most recent change and repeat these steps until
all of the changes have been reversed.
After you back out your changes, your database catalog is returned
to the particular state that you wanted.
Important: 
If
data preservation was enabled, the data files that will be imported after
the undo DDL were created when the change was deployed. If updates were made
to the database since the change that you are trying to undo was made, take
care not to overwrite important changes. Depending on the situation, you might
need to take additional action to ensure that the data being imported is current.
