AFAIK RPM uses BerkeleyDB, though it will probably switch to LMDB <a href="https:&#x2F;&#x2F;bugzilla.redhat.com&#x2F;show_bug.cgi?id=1086784" rel="nofollow">https:&#x2F;&#x2F;bugzilla.redhat.com&#x2F;show_bug.cgi?id=1086784</a>