When the Update operator executes, the actual session limit is determined by the first limiting factor that is encountered.Limits on Update Jobs
The Update operator requires one designated Teradata Database load slot.
The number of concurrent load slots is, however, configurable in the Teradata Database environment using the same MaxLoadTasks field control used by FastLoad, FastExport, and MultiLoad. For example, one Teradata PT Update job equates to one MultiLoad .IMPORT step in a MultiLoad job in the count for MaxLoadTasks.
For more information, see “DBS Control Utilities” inUtilities: Volume 1 (A-K).