LMDB/lmdb

Features

• Memory-Mapped Storage - Maps database files directly into the virtual address space to minimize data copying and system calls.
• Copy-on-Write Transaction Systems - Uses copy-on-write isolation to provide consistent snapshots and atomic commit or rollback of changes.
• Memory-Mapped File Access - Directly maps disk-based files into the process address space for instant loading and high-performance data access.
• Single-Writer Multi-Reader Locking - Implements a concurrency model allowing multiple concurrent readers while restricting write access to a single transaction.
• ACID-Compliant - Ensures atomic, consistent, isolated, and durable operations with crash safety and rollback support.
• B-Tree - Uses B+ tree structures to optimize disk-based range queries and lookups.
• B+ Tree Indexing - Implements B+ trees to store data only in leaf nodes for efficient range queries and reduced disk I/O.
• Embedded Key-Value Stores - Integrates a fast, lightweight key-value database directly into applications without requiring a separate server process.
• OS Page Cache Integration - Utilizes the system page cache to manage data persistence and retrieval without a separate application-level cache.
• Local State Caches - Provides high-performance local persistence for frequent data points with minimal overhead.
• Read-Optimized Workflows - Optimizes the storage engine for massive volumes of read operations to maximize throughput.
• Cross-Process Pointer Stability - Stores data using memory addresses that remain valid across processes via stable memory mapping.
• Databases - Fast embedded key-value store.
• Cryptography - Ultra-fast and compact key-value embedded data store.

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