Refuse DBA access to a schema?

Hi guys and gals,

        I have a good one here.

        The customer has a DB that is run and maintained in the States, i.e. All DB Admin is done over there.

        The DB has a schema, which has highly sensitive material.

        What the customer wants, is to lock out SYS and SYSTEM, and any other DBA accounts from the application schema.

        Off the top of my head, I can think of no way of doing this.

        Any ideas?

        Regards.

Tony

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S. A. Sequeira