Shuts down the specified database if you specify a databaseName. (Reconnecting to the database reboots the database.)
Shuts down the entire Derby system if and only if you do not specify a databaseName
When you are shutting down a single database, it lets Derby perform a final checkpoint on the database.
When you are shutting down a system, it lets Derby perform a final checkpoint on all system databases, deregister the JDBC driver, and shut down within the JVM before the JVM exits. A successful shutdown always results in an SQLException indicating that Derby has shut down and that there is no connection. Once Derby is shut down, you can restart it by reloading the driver. For details on restarting Derby, see "Shutting Down the System" in Chapter 1 of the Derby Developer's Guide.
Checkpointing means writing all data and transaction information to disk so that no recovery needs to be performed at the next connection.
-- shuts down entire system jdbc:derby:;shutdown=true -- shuts down salesDB jdbc:derby:salesDB;shutdown=true