History
The term Object-oriented Database System dates back to around 1985, though the first research developments in this area started during the mid-1970s. The first commercial object database management systems appeared in the early 1990s; these added the concept of native database driven persistence into the sphere of object-oriented development.
The second wave of growth was observed in the first decade of the 21st century, when Object-Oriented Databases written completely in an Object-Oriented language appeared on the market. db4o is one of the examples of such systems written completely in Java and C#.
The db4o project was started in 2000 by Chief Architect Carl Rosenberger, shipping a year later in 2001. Some 100 commercial pilot customers and community users have supported db4o from its earliest days and it has seen successful use in enterprise and academic applications prior to its commercial launch in 2004 by newly-created private company Db4objects Inc.
In 2008 the db4o OODBMS was purchased by Versant corporation, who are as of 2012 the current owners and developers of db4o. db4o is offered to the market as an open-source bi-licensed software (commercial and GPL). Since the initial launch db4o has gone through many changes and improvements (see #Versions) leading up to the release of version 8 in the latter half of 2011.
Read more about this topic: Db4o
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