Specifies the name of a database to use when processing web requests, or uses the REQUIRED or AUTO keyword to specify whether database names are required as part of the URI.
If this parameter is set to REQUIRED, the URI must specify a database name.
If this parameter is set to AUTO, the URI may specify a database name, but does not need to do so. If the URI contains no database name, the default database on the server processes web requests. Since the server must guess whether or not the URI contains a database name when set to AUTO, you should design your web site so as to avoid ambiguity.
If this parameter is set to the name of a database, that database is used to process all web requests. The URI must not contain a database name.