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LMDB offers:

• Transactions (full ACID semantics)
• Ordered keys (enabling very fast cursor-based iteration)
• Memory-mapped files (enabling optimal OS-level memory management)
• Zero copy design (no serialization or memory copy overhead)
• No blocking between readers and writers
• Configuration-free (no need to "tune" it to your storage)
• Instant crash recovery (no logs, journals or other complexity)
• Minimal file handle consumption (just one data file; not 100,000's like some stores)
• Same-thread operation (LMDB is invoked within your application thread; no compactor thread is needed)
• Freedom from application-side data caching (memory-mapped files are more efficient)
• Multi-threading support (each thread can have its own MVCC-isolated transaction)
• Multi-process support (on the same host with a local file system)
• Atomic hot backups

LmdbJava adds Java-specific features to LMDB:

• Extremely fast across a broad range of benchmarks, data sizes and access patterns
• Modern, idiomatic Java API (including iterators, enums, exceptions etc)
• Nothing to install (the JAR embeds LMDB libraries for Linux, OS X and Windows)
• Buffer agnostic (JavaByteBuffer, AgronaDirectBuffer, NettyByteBuf, your own buffer)
• 100% stock-standard, officially-released, widely-tested LMDB C code (no extra C/JNI code)
• Low latency design (allocation-free; buffer pools; optional checks can be easily disabled in production etc)
• Easy to use (just work through our step-by-step, CI-tested, fully-executabletutorial)
• Java 9 ready (JNR-FFI-based;Unsafe not required etc)
• Available fromMaven Central andOSS Sonatype Snapshots (seeChange Log)
• ComprehensiveJavaDocs
• Linux,OS X andWindows CI

Full details are in thelatest benchmark report.

We're happy to help you use LmdbJava. Simplyopen a GitHub issue if you haveany questions.

Contributions are welcome! Please see theContributing Guidelines.

This project is licensed under theApache License, Version 2.0.

This project distribution JAR includes LMDB, which is licensed underThe OpenLDAP Public License.