Place in The Database World
db4o represents an object-oriented database model. One of its main goals is to provide an easy and native interface to persistence for object oriented programming languages. Development with db4o database does not require a separate data model creation, the application’s class model defines the structure of the data in db4o database. db4o attempts to avoid the object/relational impedance mismatch by eliminating the relational layer from a software project. For more information see db4o features.
Developers using relational databases can also benefit from using db4o, which can be viewed as a complementary tool. The db4o-RDBMS data exchange can be implemented using db4o Replication System (dRS). dRS can also be used for migration between object (db4o) and relational (RDBMS) technologies.
As an embedded database db4o can be run in application process. It is distributed as a library (jar/dll).
Read more about this topic: Db4o
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