Serialization of an object graph includes class information as well as instance information. If more than one instance of the same class is serialized as separate serialization operations then the class information exists more than once. To eliminate this inefficiency the StoredClassCatalog class will store the class format for all database records stored using a SerialBinding. Refer to the ship sample code for examples (the class SampleDatabase in examples/java/src/com/sleepycat/examples/collections/ship/basic/SampleDatabase.java is a good place to start).