Tokyo Cabinet is a library of routines for managing a database. The
database is a simple data file containing records, each is a pair of a
key and a value. Every key and value is serial bytes with variable
length. Both binary data and character string can be used as a key and
a value. There is neither concept of data tables nor data types.
Records are organized in hash table or B+ tree.

WWW: http://fallabs.com/tokyocabinet/