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Administrator
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First of all; eliminate using shared accounts, implement "Least Privilege" access, and enable Unified Auditing -- these are for the future.
For high-security environments, Oracle Database Vault can be used to restrict even DBAs.. I guess you already know that. You may also consider using proxy authentication.
These are all documented.
The most impactful change and the quickest move is to create five individual named database users with DBA roles, of course.
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