DBXL forms can be reshred via the DBXL Admin Tool or via the DBXL Migration Tool. A third alternative for reshredding is a SharePoint Powershell script. The main benefit of the Powershell script is that it allows reshredding a range of DocIDs, instead of reshredding one document or ALL documents.
The Powershell script can be run from any desktop or server with Powershell installed.