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You can configure a Teradata environment with more than one Teradata database node. Each Teradata Database node in the system that runs the Teradata Database Gateway process is called a communications processor, or COP. You can configure Dynamic Data Masking for a procedure called COP discovery, which identifies COP host names in the Teradata environment and checks their availability before making a connection to an available COP host. COP discovery is useful when you want to use all of the Teradata database nodes depending on their availability.