Object-relational mappers such as RedHat's Hibernate and Oracle's
Toplink provide decent "band aid" fixes to automate this additional
work. But only db4o's native object persistence solution stores
objects exactly as they are represented in the native application,
eliminating the object-relational mismatch entirely. As a result, db4o
helps cut development costs by up to 50%, and the resulting software
assets are easier to maintain and reuse. Also, db4o runs up to 55x
faster than Hibernate, as shown by two independent benchmarks (OO7 on
www.odbms.org and Pole Position on www.polepos.org), making this
advanced database technology feasible for use in a whole new class of
applications.

Version 6 also comes with updates of two powerful components: the db4o
Replication System (dRS) v6.0, to ensure compatibility to backend
relational databases like Oracle and MySQL, and the new ObjectManager
v6.0, which helps developers browse and debug db4o databases in an
object-oriented manner.

"This release is powered by a new BTree architecture, a new query
processor and new 'Lazy Query evaluation modes' to maximize
performance while keeping memory consumption as low as possible.
db4objects has also released new versions of the dRS replication
system and the 'ObjectManager' database browser."

Embeddable: db4o is designed to be embedded in clients or other
software components completely invisible to the end user. Thus, db4o
needs no separate installation mechanism, but comes as just one easily
deployable library with a very low footprint of some 400KB

Portability and Cross-Platform Deployment: db4o supports Java's JDK
1.1.x through 5.0 and runs on J2EE and J2SE. db4o also runs with J2ME
dialects that support reflection, such as CDC, PersonalProfile,
Symbian, Savaje and Zaurus. Depending on customer demand, db4o will
also run on dialects without reflection, such as CLDC, MIDP,
RIM/Blackberry and Palm OS.