To open the maintenance form choose Administration
->
Database ... ->
Maintenance ...
from the menu and select the
Update resource data tab. In the resource edit forms the resource data,
e.g. the file size, of a single resource can be obtained from the remote server
addressed by the resource link. If for a large number of resouces the data shall
be updated it is much easier to select the
Get resource data tab. To find and delete
empty resources choose the
Clean empty resources tab.