In addition to the recommendation for using a DBD module (allows a JOIN or MINUS on the files, which are mapped as tables into the DBD module), have you considered doing this at the Unix prompt level? sort and join could accomplish what you are attempting, as long as the CSV is simple enough (no embedded / quoted newlines or delimiters).

--MidLifeXis

In reply to Re: Very Large CSV Filter by MidLifeXis
in thread Very Large CSV Filter by Locke-Eros

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