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YouTrackDB is an object-oriented graph database that supports documents, full-text search, reactivity, and geospatial concepts.
YouTrackDB has been supported and developed by YouTrack project from JetBrains.

YouTrackDB's key features are:

1. Fast data processing: Links traversal is processed with O(1) complexity. There are no expensive run-time JOINs.
2. Universal API: Implements rich graph and object-oriented data models. Rich API is the same for all types of deployments (both embedded and server).
3. SQL-like query language: Uses a dialect of SQL query language enriched by graph and object-oriented functions and commands.
4. Scalable development workflow: YouTrackDB works in schema-less, schema-mixed, and schema-full modes. The universal API allows you to port your database to any supported deployment type with zero development efforts.
5. Strong security: A strong security profiling system based on user, role, and predicate security.
6. Encryption of data at rest: Optionally encrypts all data stored on disk.
7. Binary compatibility with OrientDB: Databases created with OrientDB can be used in YouTrackDB.

YouTrackDB can run on any platform without configuration and installation. The full Server distribution is a few MBs without the demo database.