For heavily partitioned tables, do not use SQL*Loader to load data. Instead put the data in a flat file and use parallel INSERT direct load from the flat file using the external table features of database.

For heavily partitioned tables, SQL*Loader may not be the most efficient loading mechanism. Using external tables with parallel INSERT direct load provides better performance by leveraging parallel processing and direct-path insert capabilities. External tables read from flat files and enable parallel direct-path inserts, which are optimized for partitioned table loading scenarios.