Sled is an embedded key-value store and ACID-compliant database designed for high-performance data persistence. It functions as a log-structured storage engine that organizes data using B+ trees to support efficient range queries and prefix scans.
The engine implements a zero-copy data store model, utilizing epoch-based reclamation to provide direct references to cached values without memory allocations. It distinguishes itself through a combination of write-ahead logging, page cache optimizations to reduce write amplification on flash storage, and serializable transactions for atomic multi-key updates.
The library covers a broad range of capabilities, including crash recovery through checkpointing, disk storage defragmentation, and binary stream replication. It also provides reactive data observation via key-prefix event subscriptions and supports custom merge logic for atomic value transformations.
