# LMDB/lmdb

Read-only mirror of official repo on openldap.org. Issues and pull requests here are ignored. Use OpenLDAP ITS for issues.

Repository: https://github.com/LMDB/lmdb
Canonical: https://ross.abutalabs.com/products/lmdb
Homepage: http://www.openldap.org/software/repo.html
Language: C
License Family: other
Last push: 2026-08-19T14:01:02+00:00

## Health v2 (maintenance only)
Score: 76/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 35, longevity 100
- inputs: {"age_days": 4151, "days_push": 14, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license, no_readme
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3031, forks 645 (observed 2026-08-28T04:07:38.918446+00:00)

## What it is
LMDB (Lightning Memory-Mapped Database) is a compact, high-performance embedded key-value database library written in C, using memory-mapped files for fast reads with full ACID transactional guarantees. This GitHub repository is a read-only mirror of the official source hosted on openldap.org, where development and issue tracking actually occur.

## Use cases
- embed an ACID key-value store in a C/C++ application
- fast read-heavy key-value storage with memory-mapped files
- store metadata for a mail server or directory service
- replace SQLite or BDB for a low-latency embedded database
- use a transactional key-value store from Python or Go bindings
- build a cache with crash-safe persistence

## When to choose
- you need an embedded, zero-configuration key-value database with very fast reads
- you need ACID transactions and crash resilience without running a database server
- multiple processes need concurrent read access to the same data
- you want a tiny, dependency-free C library

## When to avoid
- you need a client-server database or SQL queries
- you need rich secondary indexes or document/relational features
- write-heavy workloads with large values, since LMDB favors read performance
- you expect to file issues or PRs on this mirror, which is ignored

## Facets
- artifact type: library
- maturity: stable
- function: database, caching, file-system
- domain: databases, developer-tools, performance
- platform: windows, cross-platform, c
- tags: key-value-store, memory-mapped, embedded-database, lmdb, openldap, read-only-mirror, linux, macos

## Member repositories
- LMDB/lmdb (main) score 76

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:38.918446+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:29:48.366468+00:00, confidence not recorded.
  - homepage: http://www.openldap.org/software/repo.html (fetched 2026-08-29T09:44:39.964894+00:00, sha 1771ad3290d3)
- Data as of 2026-08-30T08:39:29.467469+00:00.