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Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition by Paul Hudson, Andrew Hudson, Matthew Helmke

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OrientDB

OrientDB is a free database, released under the Apache 2.0 license. It uses a different indexing algorithm called MVRB-Tree, which it claims is significantly faster. You might remember an older relational database called Orient ODBMS. OrientDB is related and can be used with a subset of SQL, but it is a complete rewrite using a document/graph database foundation.

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