How to restrict schema A from schema B. I have a db with schema B. Our applications are written in C++ and they use schema B. We have to support a 3rd party product that will require us to install schema A ( that supports the 3rd party app ) in our db. How do I absolutely stop schema A from accessing schema B’s objects? Management want options on how to restrict access. Besides from granting privileges and assigning roles how can I stop schema A from schema B’s objects? We already use security policies and have discussed building a separate db for schema A. Has anybody else had this problem and how did they overcome it? thanks.