Loading Data into Temporal Tables
Teradata Database supports two methods of bulk loading data into temporal tables:
Do not use CURRENT INSERT (valid time or transaction time) if the FastLoad script includes a CHECKPOINT specification. Restarts during loading can change the valid time and transaction time values for rows that are inserted after the restart.
In this case, use NONTEMPORAL INSERT instead, to ensure an exact one-to-one correspondence between the number of rows inserted and the number of rows that results in the target table.