Man pages matching name dbm::deep::iterator::file::index in section 3pm:

DBM::Deep::Iterator::File::Index.3pm.en	debian 10 / libdbm-deep-perl
DBM::Deep::Iterator::File::Index.3pm.en	debian 11 / libdbm-deep-perl
DBM::Deep::Iterator::File::Index.3pm.en	debian 12 / libdbm-deep-perl