Optimal Network Communication Strategies
To minimize the cost of internodal communication, Teradata Database uses a non‑collision, point‑to‑point monocast communication architecture whenever possible. As a result, a single sender is connected with a single receiver analogous to how calls between individuals are routed over a telephone network. This is less costly from the perspective of system resource usage than broadcasting the same information to all AMPs in the system.
Of course, whenever all AMPs require the same information, such as duplicating the rows of a table on another AMP to make a join or sending a dispatcher message for an all‑AMPs operation such as a table‑level lock, Teradata Database broadcasts the message across the BYNET.