/DATABASE
       /DIRECTORY_TREE

    Controls whether the message files scanned are only those with
    entries in the queue cache database, /DATABASE, or all message
    files actually present in the channel queue directory tree,
    /DIRECTORY_TREE.

    When neither /DATABASE nor /DIRECTORY_TREE is specified, then the
    "view" selected with the VIEW command will be used. If no VIEW
    command has been issued, then /DIRECTORY_TREE is assumed.