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libmdbx documentation

libmdbx is an embedded transactional key-value database: compact, extremely fast (memory-mapped, B+tree, O(log N)), ACID, crash-safe by default, with no WAL and no server process — safe for concurrent multi-process access.

Choose a section:

  • Overview — what libmdbx is, its characteristics, comparison with alternatives, and when to choose it (plus the honest list of restrictions and gotchas).
  • Getting started — forms of delivery, how to build, first steps with the API, and durability modes.
  • Textbook — a practical guide in six volumes, from the first steps to expert topics and bindings.
  • Deep dive — the architecture, internal mechanisms, and what libmdbx improves over LMDB.
  • Reference — the C/C++ API reference, command-line tools, and the change log.

The documentation is available in English and Russian — use the language pill in the top-right corner of any page to switch.