Oracle Database Discussions

I would like to use sqlldr direct path to load millions of records in the table but direct path allows duplicates on the primary key constraints.

inserts duplicates
sqlldr deploy_ctl/deploy_ctl@dba01mdm control=ctl_test.ctl direct=true
primary key is enabled

I am not understanding the behavior that why primary key is still enabled -- (logically it should have disabled than inserted duplicates)

does not insert duplicates
sqlldr deploy_ctl/deploy_ctl@dba01mdm control=ctl_test.ctl
primary key is enabled

Please can I know if there is any work around to use direct path with primary constraints in place.