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LMDB is a software library that provides a transactional database in the form of a key-value store. LMDB stores arbitrary key/data pairs as byte arrays, has a range-based search capability, and supports multiple data items for a single key. LMDB is fully thread-aware and supports concurrent read/write access from multiple processes and threads.
For details on the underlying technology, we refer to the OpenLDAP home page https://www.openldap.org/.