This topic set explains the specifics of db4o implementation. Going through the topics will help you to reveal the real power of db4o and learn to apply it in your environment.
Maintenance
Type Handling
Using Annotations
Using Attributes
Unique Constraints
Object Callbacks
Callbacks
Translators
Marshallers
Db4o Reflection API
IO Adapter
Db4o meta-information
Native Query Collection
Data Binding
Refactoring and Schema Evolution
Aliases
Encryption
Class Mapping
IDs and UUIDs
Freespace Management System
Reporting
Exceptions