In earlier versions of Adaptive Server, set proxy allowed you to switch your server user identity to any other server login, but it did not allow you to limit use of set proxy based on the target login roles. When you granted set proxy to a user, this user could become any other server user.
As of Adaptive Server version 12.5.2, you can grant set proxy...restricted role, which allows you to restrict which roles cannot be acquired when switching identities.
For more information about set proxy, see Chapter 12, “Changes to Global Variables, Commands, and Stored Procedures.”
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