## OrientDB

[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
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<!---<img src="http://orientdb.com/orientdb-studio_800px.png">-->

## 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/3.1.x/gettingstarted/) | [OrientDB Community Group](https://github.com/orientechnologies/orientdb/discussions).

## 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/3.1.x/internals/Transactions.html) and [SQL](https://orientdb.org/docs/3.1.x/sql/) as query language. In this way it's easy to start using it without having to learn too much new stuff. 

## Scalability: the database is the bottleneck of most applications

The most common reason applications scale out badly is, very often, the database. The database is the bottleneck of most applications. OrientDB scales out very well on multiple machines. The database can be up to 302,231,454,903,657 billion (2^78) records for the maximum capacity of 19,807,040,628,566,084 Terabytes of data on a single server or multiple nodes.

## 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. The full Server distribution is a few MBs without the demo database. 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 < 3.1.x](http://orientdb.org/docs/3.1.x/)
- [Documentation Version > 3.2.x](https://orientdb.com/docs/3.2.x/)
- For any questions visit the [OrientDB Community Group](https://github.com/orientechnologies/orientdb/discussions)

[Get started with OrientDB](http://orientdb.org/docs/3.1.x/gettingstarted/).

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

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[![security status](https://www.meterian.io/badge/gh/orientechnologies/orientdb/security)](https://www.meterian.io/report/gh/orientechnologies/orientdb) | [![stability status](https://www.meterian.io/badge/gh/orientechnologies/orientdb/stability)](https://www.meterian.io/report/gh/orientechnologies/orientdb)


### 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}
}
```