Relay Services Gateway (RSG)
The RSG is a Teradata VPROC that relays messages between Teradata and the MDS DDL Gateway.
Whenever a Teradata Database System processes a Data Definition Language (DDL) statement, it sends the DDL to the RSG, which sends it on to the MDS DDL Gateway. The DDL Gateway then updates the metadata in the MDS repository. An example of a DDL is:
create table mytable (c1 int);
Every Teradata node of the Teradata Database System must have an RSG VPROC running.
The RSG communicates through TCP/IP with the MDS DDL Gateway.