超級快、小的 key-value 數據存儲： Lightning MDB
LMDB 是一個超級快、超級小的 key-value 數據存儲服務，是由 OpenLDAP 項目的 Symas 開發的。使用內存映射文件，因此讀取的性能跟內存數據庫一樣。其大小受限于虛擬地址空間的大小。
- Ordered-map interface (keys are always sorted, supports range lookups)
- Fully transactional, full ACID semantics with MVCC.
- Reader/writer transactions: readers don't block writers and writers don't block readers. Writers are fully serialized, so writes are always deadlock-free.
- Read transactions are extremely cheap, and can be performed using no mallocs or any other blocking calls.
- Supports multi-thread and multi-process concurrency, 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/compaction required.
- No application-level caching. LMDB fully exploits the operating system's buffer cache.
- 32KB of object code and 6KLOC of C.
- Licensed under the OpenLDAP Public License
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