Usage of BULK mode in session property

Can you please tell me the usage of BULK mode in session property. When I tried to load data (above 25 million records) into my target my table the session got failed. With Normal mode it ran fine. What are the things we need to consider in the case of BULK mode? Please share it clearly.

[B]Question asked by visitor Balaji[/b]

when we use update strategy update or insert type in session properties we should not go for bulk loading.while using bulk mode make sure in session properties that treat row as data driven.it is mainly used to load a bulk of records instead of loading updated records.