Internal Program Version: DB::File  1.859.0.5.42.0

*DB_File* is a module which allows Perl programs to make use of the
facilities provided by Berkeley DB version 1.x (if you have a newer version
of DB, see Using DB_File with Berkeley DB version 2 or greater). It is
assumed that you have a copy of the Berkeley DB manual pages at hand when
reading this documentation. The interface defined here mirrors the Berkeley
DB interface closely.

https://metacpan.org/release/DB_File