This manual page describes the specific details of the Db class, which is the center of access activity.
The currently supported file formats are btree, hashed and recno. The btree format is a representation of a sorted, balanced tree structure. The hashed format is an extensible, dynamic hashing scheme. The recno format supports fixed or variable length records (optionally retrieved from a flat text file).
Storage and retrieval for the Db access methods are based on key/data pairs, using the Dbt class.