Tokyo Cabinet is the successor of QDBM, a high performance database library similar to the DBM family. It also supports hash and B-tree databases and does not require any server process. The overall speed is improved compared to QDBM.
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.
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..