There are other approaches to this like using DB_File or some kind of RDBMS but I actually think overall you will have a simpler and probably more efficient system if you just use some kind of approach to scale the data down. Splitting data into bite sized chunks is an ancient and honorable programming tradition. :-)
... and it's exactly how DBM (and therefore, indexes for RDBM too) do their jobs. What else do you think binary search, B-trees, Beta-trees etc. are, but splitting up the date in ever smaller chunks?
I don't think you'll be able to beat this kind of databases, in their own game.
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