To start SQL*Loader in direct path load mode, set the DIRECT parameter to TRUE on the command line or in the parameter file, if used, in the format:
DIRECT=TRUE
"Optimizing Performance of Direct Path Loads" for information about parameters you can use to optimize performance of direct path loads
"Optimizing Direct Path Loads on Multiple-CPU Systems" if you are doing a direct path load on a multiple-CPU system or across systems