When loading a partitioned or subpartitioned table, SQL*Loader partitions the rows and maintains indexes (which can also be partitioned). Note that a direct path load of a partitioned or subpartitioned table can be quite resource-intensive for tables with many partitions or subpartitions.
If you are performing a direct path load into multiple partitions and a space error occurs, then the load is rolled back to the last commit point. If there was no commit point, then the entire load is rolled back. This ensures that no data encountered after the space error is written out to a different partition.
You can use the ROWS parameter to specify the frequency of the commit points. If the ROWS parameter is not specified, then the entire load is rolled back.