First of all, thanks a lot (and for the others who replied too)

Can you afford 108 MB of ram?

Sure!

rewrite your file in binary, packing each KV pair using 'NS'.

Well, I'm not sure if I did it right:

perl -i.bak -lane 'print pack "NS",@F' dataset.txt

[download]

But when applying the binary search, I'm getting weird keys and values (i.e. keys out of range, etc...)

citromatik

Update:Also, the resulting binary file is 127Mb (132195175), not 108. Maybe the original file has errors (?). I will check

In reply to Re^4: fast lookups in files by citromatik
in thread fast lookups in files by citromatik

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