A database-wide property always has persistence. That is, its value is
stored in the database. Typically, it is in effect until you explicitly change
the property or until you set a system-wide property with precedence over
database-wide properties (see Precedence of properties).
A system-wide property might have persistence, depending on how you set
it. If you set it programmatically, it persists only for the duration of the
JVM of the application that set it. If you set it in the
derby.properties file, a property persists until:
- That value is changed
- The file is removed from the system
- The database is booted outside of that system