In early versions of VuFind®, changing the database name was a complex process; because use of these old versions is no longer encouraged, the documentation has been removed (but can be found in earlier page versions through the “Old revisions” link below).
In VuFind® 2.0 and later, you can easily specify a non-default database name using the database setting in config.ini without needing any other special configuration changes, and this can be set up for you using VuFind®'s web-based installer.