[kurt@amber]$ ll
total 436
-rw-------    1 kurt     kurt        12288 Nov 22 22:09 new.db
-rw-r--r--    1 kurt     kurt       212992 Nov 22 21:35 old.db
[kurt@amber]$ file old.db
old.db: Berkeley DB (Hash, version 5, native byte-order)
[kurt@amber]$ file new.db
new.db: Berkeley DB (Hash, version 7, native byte-order)
[kurt@amber]$ db_dump old.db
db_dump: old.db: hash version 5 requires a version upgrade
db_dump:open:old.db:DB_OLDVERSION:Database requires a version upgrade
[kurt@amber]$ db_dump185 old.db
db_dump185: old.db: Invalid argument
[kurt@amber]$