Massload Tool

Nice article on massload tool

http://www.ibm.com/developerworks/websphere/library/techarticles/0806_lagamba/0806_lagamba.html

Below link provides additional info on resolving primary key values.

http://pic.dhe.ibm.com/infocenter/wchelp/v7r0m0/topic/com.ibm.commerce.developer.doc/refs/rml_idresgen_dev.htm?resultof=%22%69%64%72%65%73%67%65%6e%22%20