Extract From CiteSeer about Fast Record Linkage
"Record linkage of millions of individual health records for ethically-approved research purposes is a computationally expensive task. Blocking methods are used in record linkage systems to reduce the number of candidate record comparison pairs to a feasible number whilst still maintaining linkage accuracy. New blocking methods have been implemented recently using high-dimensional indexing or clustering algorithms."
A Comparison of Fast Blocking Methods for Record Linkage
http://www.google.co.in/url?sa=U&start=3&q=http://datamining.anu.edu.au/publications/2003/kdd03-6pages.pdf&e=9797
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