Removing PCD and UCD Personalization Data
System administrators can remove personalization data from the PCD (Portal Content Directory) and UCD (User Content Directory) by using the Personalization Data Cleanup tool. Adminstrators can also remove PCD personalization from code.
Context
You can remove personalization data for:
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All applications/objects personalized by all users
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All applications/objects personalized by a specific user
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All users who have personalized a specific application/object
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A specific user who has personalized a specific application/object
You can also remove all unused personalization data by deleting PCD and UCD content and personalization data of users that are no longer in the system. We recommend removing unused personalization data on a periodic basis. The removal of unused personalization data may impact portal performance while the operation is taking place. However, as a result of the cleanup, portal performance may improve.

