OrientDB

OrientDB is written in Java open source NoSQL database. OrientDB is a document-oriented database that has properties of graph databases has additionally: The information units are stored in individual documents. Relationships between the documents may be prepared by direct connections between the nodes. This results in graph structures, which can be processed performant.

OrientDB supports different schemes modes (free, fixed and mixed) and has a rating based on users and roles authentication and authorization. SQL is supported as a query language. OrientDB implements a MVRB tree as indexing algorithm which is derived from the red-black tree and B- tree. The MVRB - Tree is characterized by rapid insertions and search.

Properties

• ACID transactions are supported. In a crash, the waiting for processing documents, the system restores.
• OrientDB conforms to the TinkerPop Blueprints standard for graph databases.
• The database language SQL support - with extensions to reflect the relations without SQL joins.
• HTTP, RESTful protocols and JSON can be implemented without the use of third -party libraries or components thereof.
• The engine is 100% Java; it runs on Linux, Windows and any other system that supports Java.
• OrientDB has a local mode for database access, making it embeddable in other programs.
• Commercial support is available.