!!! Overview[1]
[{$pagename}] or [LMDB] is a software library that provides a high-performance embedded transactional database in the form of a key-value store. 

[{$pagename}] is written in C with API bindings for several programming languages. 

[{$pagename}] stores arbitrary key/data pairs as byte arrays, has a range-based search capability, supports multiple data items for a single key and has a special mode for appending records at the end of the database (MDB_APPEND) which gives a dramatic write performance increase over other similar stores.

[{$pagename}] is not a relational database but like Berkeley DB and other similar databases such as dbm is strictly a key-value store.

[{$pagename}] design was first discussed in a 2009 post to the [OpenLDAP] developer mailing list, in the context of exploring solutions to the cache management difficulty caused by the project's dependence on Berkeley DB. A specific goal was to replace the multiple layers of configuration and caching inherent to Berkeley DB's design with a single, automatically managed cache under the control of the host operating system.

[OpenLDAP] can use [{$pagename}] for which [{$pagename}] was originally developed via back-mdb.

Author [Howard Chu] made clear that [{$pagename}] is part of the [OpenLDAP] project, which had its BSD style license before he joined, and it will stay like it.

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Lightning_Memory-Mapped_Database|Wikipedia:Lightning_Memory-Mapped_Database|target='_blank'] - based on data observed:2015-06-03