Adam Sottosanti (2/3/2011)

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Agreed. I try to avoid the cartesian joins during matching as much as I can, and generally require certain demographics to match (inner join on DOB + Gender instead of cross join) to limit the result set, then also limit the amount I run through at a time. I may miss a handful of records with this approach, but they are easy to identify, and since the matching is fuzzy to begin with, you are going to need a clean up process anyway.