By default VoltDB does not perform authentication and client applications have full access to the database. To enable authentication, add the <security> tag to the configuration file. You can enable security when you initialize the database root directory, or you can use voltadmin update to change the security setting on the running database. (Or you can change the setting interactively through the VoltDB Management Center.)

<deployment>
   <security enabled="true"/>
       . . .
</deployment>