Symas LMDB

by Symas

An ultra-fast, ultra-compact, crash-proof key-value embedded data stor

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Helps with: Key Value and Tuple Store,NoSQL DB

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What is it all about?

Symas LMDB is an extraordinarily fast, memory-efficient database developed by Symas for the OpenLDAP Project. With memory-mapped files, it has the read performance of a pure in-memory database while retaining the persistence of standard disk-based databases. In other words, it runs like a bat out of hell, performing several times faster than other DB engines — several orders of magnitude faster in many cases. No buffers or caches needed, no memory copies generated. And it’s only limited to the s

Key Features

* Ordered-map interface (keys are always sorted; range lookups are supported) * Fully-transactional, full ACID semantics with MVCC * Reader/writer transactions (readers don’t block writers; writers don’t block readers) * Fully serialized writers (writes are always deadlock-free) * Extremely cheap read transactions, which can be performed using no mallocs or any other blocking calls * Multi-thread and multi-process concurrency supported; environments may be opened by multiple processes on the same host * Multiple sub-databases may be created with transactions covering all sub-databases * Memory-mapped, allowing for zero-copy lookup and iteration * Maintenance-free (no external process or background cleanup or compaction required) * Crash-proof (no logs or crash recovery procedures required) * No application-level caching (LMDB fully exploits the operating system’s buffer cache) * 32KB of object code and 6KLOC of C