You plan to move data from a flat file to a table in your database. You decide to use SQL*Loader directpath load method to perform this task. The table in which you plan to load data is an important tablehaving various integrity constraints defined on it. 
Which constraints will remain enabled by default during this operation（）

You are using flat files as the data source for one of your data warehousing applications. To optimizethe application performance， you plan to move the data from the flat files toclustered tablesin an Oracle database. 
While migrating the data， you want to have minimal impact on the database performance and optimize thedata load operation.
Which method would you use to load data into the Oracle database（）