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LMDB 1.0 is a high-performance, transactional key-value store database library with ACID semantics, memory-mapped storage, and full thread/process safety. The new version includes upgrades from 0.9 and continues to offer a simple, robust embedded database solution.
A tweet discusses the idea of building a transactional database with infinite throughput using S3-like object storage and content-addressing, where blocks are written in parallel and the root hash is updated periodically.