Hi, and thanks for your reply.

The data isn't quite representable, and that was perhaps a bit stupid of me.A more proper representation is below (3 random lines).
The data is sorted lexicographically on the first number.
106896752;384407;root;cellular organisms;Eukaryota;Viridiplantae;Strep
+tophyta;Streptophytina;Embryophyta;Tracheophyta;Euphyllophyta;Spermat
+ophyta;Magnoliophyta;Mesangiospermae;eudicotyledons;Gunneridae;Pentap
+etalae;rosids;fabids;Fabales;Fabaceae;Papilionoideae;Genisteae;Lupinu
+s;Lupinus magnistipulatus;
124405058;5888;root;cellular organisms;Eukaryota;Alveolata;Ciliophora;
+Intramacronucleata;Oligohymenophorea;Peniculida;Parameciidae;Parameci
+um;Paramecium tetraurelia;
134053560;349161;root;cellular organisms;Bacteria;Firmicutes;Clostridi
+a;Clostridiales;Peptococcaceae;Desulfotomaculum;Desulfotomaculum redu
+cens;Desulfotomaculum reducens MI-1;

[download]
In total there is about 160 million records

In reply to Re^2: Using indexing for faster lookup in large file by anli_
in thread Using indexing for faster lookup in large file by anli_

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