一個快速的Key-Value存儲引擎：forestdb
ForestDB是一個快速的Key-Value存儲引擎，由 Couchbase Caching 和 Storage 團隊開發，并且它的主要索引結構構建自 Hierarchical B+-Tree based Trie，叫做 HB+-Trie。
主要特性
- Keys and values are treated as an arbitrary binary.
- Applications can supply a custom compare function to support a customized key order.
- A value can be retrieved by its sequence number or disk offset in addition to a key.
- Write-Ahead Logging (WAL) and its in-memory index are used to reduce the main index lookup / update overhead.
- Multi-Version Concurrency Control (MVCC) support and append-only storage layer.
- Multiple snapshot instances can be created from a given ForestDB instance to provide different views of database.
- Rollback is supported to revert the database to a specific point.
- Ranged iteration by keys or sequence numbers is supported for a partial or full range lookup operation.
- Manual or auto compaction can be configured per ForestDB database file.
- Transactional support with read_committed or read_uncommitted isolation level. </ul>
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