I think most of us are keenly aware that Berkeley DB 5.x is dead. While Oracle
has Berkeley DB 6.x, it is licensed AGPLv3, which seems to make some people
rather skittish.
As a potential alternative, why not use
[LMDB](https://symas.com/products/lightning-memory-mapped-database/)? Projects
like OpenLDAP, CFEngine, Postfix, etc. have moved to LMDB or use it by default
from BDB after BDB 6 arrived.
LMDB is available in Fedora, Mageia, and openSUSE already, so the dependency
would already be available for us to use. It should also be easy to support
having internal LMDB like OpenSUSE does now for BDB (the [LMDB
sources](https://github.com/LMDB/lmdb) look like they're built in a rather
simple manner, so embedding it shouldn't be terrible).
According to [the LMDB web page on projects using
LMDB](https://symas.com/products/lightning-memory-mapped-database/involvement-in-other-projects/):
> Note, because it’s so easy to modify BerkeleyDB-based projects to use LMDB
> instead, the list of BerkeleyDB-based adaptations is growing quickly.
I'm not sure how true it is, but it seems to bear out with the number of
previously BDB users now being LMDB users.
LMDB is licensed under the OpenLDAP license, which is a BSD-style license, so
people who freaked out over BDB 6 shouldn't be freaking out over LMDB.
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