Dbm::deep is an unique flat-file database module, written in pure perl. true multi-level hash/array support (unlike mldbm, which is faked), hybrid oo / tie() interface, cross-platform ftpable files, acid transactions, and is quite fast. can handle millions of keys and unlimited levels without significant slow-down. written from the ground-up in pure perl -- this is not a wrapper around a c-based dbm.