What is the impact of RI (referential integrity) on the load process ?

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What is the impact of RI (referential integrity) on the load process ?

What is the impact of RI (referential integrity) on the load process ? Is there a difference between hard/soft RI when we talk about load ?

 

I know Teradata does not check data integrity in case of soft RI. But are there more differences related to the different load tools ?