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Build and Deployment](https://github.com/lmdbjava/lmdbjava/workflows/Maven%20Build%20and%20Deployment/badge.svg)](https://github.com/lmdbjava/lmdbjava/actions)\n[![codecov](https://codecov.io/gh/lmdbjava/lmdbjava/branch/master/graph/badge.svg)](https://codecov.io/gh/lmdbjava/lmdbjava)\n[![Javadocs](http://www.javadoc.io/badge/org.lmdbjava/lmdbjava.svg?color=blue)](http://www.javadoc.io/doc/org.lmdbjava/lmdbjava)\n[![Maven Central](https://img.shields.io/maven-central/v/org.lmdbjava/lmdbjava.svg?maxAge=3600)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.lmdbjava%22%20AND%20a%3A%22lmdbjava%22)\n\n# LMDB for Java\n\n[LMDB](http://symas.com/lmdb/) offers:\n\n* Transactions (full ACID semantics)\n* Ordered keys (enabling very fast cursor-based iteration)\n* Memory-mapped files (enabling optimal OS-level memory management)\n* Zero copy design (no serialization or memory copy overhead)\n* No blocking between readers and writers\n* Configuration-free (no need to \"tune\" it to your storage)\n* Instant crash recovery (no logs, journals or other complexity)\n* Minimal file handle consumption (just one data file; not 100,000's like some stores)\n* Same-thread operation (LMDB is invoked within your application thread; no compactor thread is needed)\n* Freedom from application-side data caching (memory-mapped files are more efficient)\n* Multi-threading support (each thread can have its own MVCC-isolated transaction)\n* Multi-process support (on the same host with a local file system)\n* Atomic hot backups\n\n**LmdbJava** adds Java-specific features to LMDB:\n\n* [Extremely fast](https://github.com/lmdbjava/benchmarks) across a broad range of benchmarks, data sizes and access patterns\n* Modern, idiomatic Java API (including iterators, key ranges, enums, exceptions etc)\n* Nothing to install (the JAR embeds the latest LMDB libraries for Linux, OS X and Windows)\n* Buffer agnostic (Java `ByteBuffer`, Agrona `DirectBuffer`, Netty `ByteBuf`, your own buffer)\n* 100% stock-standard, officially-released, widely-tested LMDB C code (no extra C/JNI code)\n* Low latency design (allocation-free; buffer pools; optional checks can be easily disabled in production etc)\n* Mature code (commenced in 2016) and used for heavy production workloads (eg \u003e 500 TB of HFT data)\n* Actively maintained and with a \"Zero Bug Policy\" before every release (see [issues](https://github.com/lmdbjava/lmdbjava/issues))\n* Available from [Maven Central](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.lmdbjava%22%20AND%20a%3A%22lmdbjava%22) and [Central Portal Snapshots](https://central.sonatype.com/repository/maven-snapshots/org/lmdbjava/lmdbjava)\n* [Continuous integration](https://github.com/lmdbjava/lmdbjava/actions) testing on Linux, Windows and macOS with Java 8, 11, 17, 21 and 25\n\n### Performance\n\n![img](https://raw.githubusercontent.com/lmdbjava/benchmarks/master/results/20160710/4-intKey-seq-summary.png)\n\n![img](https://raw.githubusercontent.com/lmdbjava/benchmarks/master/results/20160710/4-intKey-rnd-summary.png)\n\nFull details are in the [latest benchmark report](https://github.com/lmdbjava/benchmarks/blob/master/results/20160710/README.md).\n\n### Documentation\n\n* [Wiki](https://github.com/lmdbjava/lmdbjava/wiki/)\n* [Tutorial](https://github.com/lmdbjava/lmdbjava/tree/master/src/test/java/org/lmdbjava/TutorialTest.java)\n* [JavaDocs](http://www.javadoc.io/doc/org.lmdbjava/lmdbjava)\n* [Change Log](https://github.com/lmdbjava/lmdbjava/wiki/Change-Log)\n\n### Support\n\nWe're happy to help you use LmdbJava. Simply\n[open a GitHub issue](https://github.com/lmdbjava/lmdbjava/issues) if you have\nany questions.\n\n### Building\n\nLmdbJava uses a standard Maven build. Its native libraries are provided by the\n[`org.lmdbjava:native`](https://github.com/lmdbjava/native) dependency.\n\nTo use a different LMDB library, set `lmdbjava.native.lib` system property to the file path.\n\n### Contributing\n\nContributions are welcome! Please see the [Contributing Guidelines](CONTRIBUTING.md).\n\n### License\n\nThis project is licensed under the\n[Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0.html).\n\nThis project distribution JAR includes LMDB, which is licensed under\n[The OpenLDAP Public License](http://www.openldap.org/software/release/license.html).\n","funding_links":[],"categories":["数据库","Memory and concurrency","\u003ca name=\"Java\"\u003e\u003c/a\u003eJava"],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flmdbjava%2Flmdbjava","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Flmdbjava%2Flmdbjava","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flmdbjava%2Flmdbjava/lists"}