PolePosition benchmark results

Melbourne: writes, reads and deletes unstructured flat objects of one kind in bulk mode
Sepang: writes, reads and then deletes an object tree
Bahrain: write, query, update and delete simple flat objects individually
Imola: retrieves objects by native id
Barcelona: writes, reads, queries and deletes objects with a 5 level inheritance structure

db4o/6.4.14.8058: the open source object database for Java and .NET
Hibernate/hsqldb: relational persistence for idiomatic Java
Hibernate/mysql: relational persistence for idiomatic Java
JDBC/MySQL: the world's most popular open source database
JDBC/Mckoi: an open source Java SQL database system
JDBC/JavaDB: Sun's supported distribution of Apache Derby
JDBC/HSQLDB: lightweight 100% Java SQL database engine
JDBC/SQLite: a small C library that implements a self-contained, embeddable, zero-configuration SQL database engine.