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orientdb

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OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID Transactions, Full-Text indexing and Reactive Queries.

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## OrientDB

[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
[![REUSE status](https://api.reuse.software/badge/github.com/orientechnologies/orientdb)](https://api.reuse.software/info/github.com/orientechnologies/orientdb)

------

## What is OrientDB?

**OrientDB** is an Open Source Multi-Model [NoSQL](http://en.wikipedia.org/wiki/NoSQL) DBMS with the support of Native Graphs, Documents, 
Full-Text search, Reactivity, Geo-Spatial and Object Oriented concepts. It's written in Java and it's amazingly fast. 
No expensive run-time JOINs, connections are managed as persistent pointers between records. 
You can traverse thousands of records in no time. Supports schema-less, schema-full and schema-mixed modes. 
Has a strong security profiling system based on user, roles and predicate security and supports [SQL](https://orientdb.org/docs/3.1.x/sql/) amongst the query languages. 
Thanks to the [SQL](https://orientdb.org/docs/3.1.x/sql/) layer it's straightforward to use for people skilled in the Relational world.

[Get started with OrientDB](http://orientdb.org/docs/3.2.x/gettingstarted/) | 
[OrientDB Community Group](https://github.com/orientechnologies/orientdb/discussions) | 
[Dev Updates](https://fosstodon.org/@orientdb) | 
[Community Chat](https://matrix.to/#/#orientdb-community:matrix.org) .

## Is OrientDB a Relational DBMS?

No. OrientDB adheres to the [NoSQL](http://en.wikipedia.org/wiki/NoSQL) movement even though it supports [ACID Transactions](https://orientdb.org/docs/3.2.x/internals/Transactions.html) and 
[SQL](https://orientdb.org/docs/3.2.x/sql/) as query language. In this way it's easy to start using it without having to learn too much new stuff.

## Easy to install and use

Yes. OrientDB is totally written in [Java](http://en.wikipedia.org/wiki/Java_%28programming_language%29) and can run on any platform without configuration and installation. 
Do you develop with a language different than Java? No problem, look at the [Programming Language Binding](http://orientdb.org/docs/3.1.x/apis-and-drivers/).

## Main References
- [Documentation Version < 3.2.x](http://orientdb.org/docs/3.1.x/)
- For any questions visit the [OrientDB Community Group](https://github.com/orientechnologies/orientdb/discussions)

[Get started with OrientDB](http://orientdb.org/docs/3.2.x/gettingstarted/).

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## Contributing

For the guide to contributing to OrientDB checkout the [CONTRIBUTING.MD](https://github.com/orientechnologies/orientdb/blob/develop/CONTRIBUTING.md)

All the contribution are considered licensed under Apache-2 license if not stated otherwise.

--------

## Licensing
OrientDB is licensed by OrientDB LTD under the Apache 2 license. OrientDB relies on the following 3rd party libraries, which are compatible with the Apache license:

- Javamail: CDDL license (http://www.oracle.com/technetwork/java/faq-135477.html)
- java persistence 2.0: CDDL license
- JNA: Apache 2 (https://github.com/twall/jna/blob/master/LICENSE)
- Hibernate JPA 2.0 API: Eclipse Distribution License 1.0
- ASM: OW2

References:
- Apache 2 license (Apache2):
  http://www.apache.org/licenses/LICENSE-2.0.html

- Common Development and Distribution License (CDDL-1.0):
  http://opensource.org/licenses/CDDL-1.0

- Eclipse Distribution License (EDL-1.0):
  http://www.eclipse.org/org/documents/edl-v10.php (http://www.eclipse.org/org/documents/edl-v10.php)
  
### Sponsors

[![](http://s1.softpedia-static.com/_img/sp100free.png?1)](http://www.softpedia.com/get/Internet/Servers/Database-Utils/OrientDB.shtml#status)

--------

### Reference

Recent architecture re-factoring and improvements are described in our [BICOD 2021](http://ceur-ws.org/Vol-3163/BICOD21_paper_3.pdf) paper:

```
@inproceedings{DBLP:conf/bncod/0001DLT21,
  author    = {Daniel Ritter and
               Luigi Dell'Aquila and
               Andrii Lomakin and
               Emanuele Tagliaferri},
  title     = {OrientDB: {A} NoSQL, Open Source {MMDMS}},
  booktitle = {Proceedings of the The British International Conference on Databases
               2021, London, United Kingdom, March 28, 2022},
  series    = {{CEUR} Workshop Proceedings},
  volume    = {3163},
  pages     = {10--19},
  publisher = {CEUR-WS.org},
  year      = {2021}
}
```

orientdb

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