Single database shutdown
An application can shut down a single database within a Derby system and leave the rest of the system running.
Storage and recovery
A Derby database (unless it is an in-memory database) provides persistent storage and recovery. Derby ensures that all committed transactions are durable, even if the system fails, through the use of a database transaction log.
Derby tables and indexes, known as conglomerates, consist of two or more pages.
You can set many Derby properties as database-level properties. When set in this way, they are stored in the database and "travel" with the database unless overridden by a system property.