# derby.properties

The text file derby.properties contains the definition of properties, or configuration parameters that are valid for the entire system.

The derby.properties file is not automatically created. If you want to set Derby properties with this file, you need to create the file yourself. The derby.properties file should be in the format created by the `java.util.Properties.save` method. For more information about properties and the derby.properties file, see Tuning Derby.

Parent topic: Derby system
Related concepts
Booting databases
Double-booting system behavior
Recommended practices