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 Derby
embedded		H2
embedded		HSQLDB
embedded		SQLite
embedded		DB4O
embedded		ObjectDB
embedded		Derby
server		H2
server		MySQL
server		PostgreSQL
server		ObjectDB
server
DataNucleus           
EclipseLink           
Hibernate           
OpenJPA           
ObjectDB           

Disk space efficiency chart - The Y-Axis represents normalized score in logarithmic scale - higher is better:
JPA performance benchmark comparision Hibernate, EclipseLink, OpenJPA, DataNucleus, ObjectDB

Disk space efficiency chart - The Y-Axis represents normalized score in linear scale - higher is better:
JPA performance benchmark comparision Hibernate, EclipseLink, OpenJPA, DataNucleus, ObjectDB