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QDBM is a library of routines for managing a database. It is developed referring to GDBM for the purpose of the following three points: higher processing speed, smaller size of a database file, and simpler API..
QLink is a small tool based on Mathlink and the QDBM (http://qdbm.sourceforge.net/) database that allows to use the database directly from Wolfram Mathematica. With the help of QLink one can avoid the operative memory restriction.