Now that you are done, if you want to test yourself, go back into the source files and make some changes. Things you might try are:
Change the language that the client application uses to fetch output from the Select stored procedure.
Add the words "Hello" and "World" in another language (say, German) by adding another call to the Insert stored procedure.
Add another field, COLOR, to the table in the SQL DDL and update the stored procedures and client application appropriately to store and retrieve the phrase "Hello, green world!" in multiple languages.
Note that although the Hello World example works and demonstrates how to perform basic database functions using VoltDB, it does not show off VoltDB's best features: throughput and scalability. To better understand how to design applications that take advantage of VoltDB key benefits, see the Hello World Revisited tutorial in the VoltDB Performance Guide.