(I find this whole post ironic. We made LMDB as a standalone library so other projects could use it, of course. But for applications like this - scalable, fulltext search, nothing comes anywhere close to OpenLDAP. Somebody else in this thread mentioned "triple-digit queries per second" as if that was a difficult achievement. OpenLDAP handles queries with complex filters at millions of queries per second. It also has a complete security model, providing fine grained access control, something none of these newer projects have even begun to think about. You guys all need to study existing tech better before starting to write your own solutions...)