Failure during upload   If the failure occurs while building or applying the upload, the remote database is left in exactly the same state as at the start of synchronization. At the server, any part of the upload that has been applied is rolled back.

Failure between upload and download   If the failure occurs once the upload is complete, but before the MobiLink client receives the download, the client cannot be certain whether the uploaded changes were successfully applied to the consolidated database. The upload might be fully applied and committed, or the failure may have occurred before the server applied the entire upload. The MobiLink server automatically rolls back incomplete transactions in the consolidated database.

The MobiLink client maintains a record of all uploaded changes in case they must be sent again. The next time the client synchronizes, it requests the state of the previous upload before building the new upload. If the previous upload was not committed, the new upload contains all changes from the previous upload.

Failure during download   When a failure occurs on the remote device while applying the download, any part of the download that has been applied is rolled back and the remote database is left in the same state as before the download.

If you are using blocking download acknowledgement, the MobiLink server also rolls back the download transaction in the consolidated database.

If you are using non-blocking download acknowledgement, the download transaction has already been committed, but neither the nonblocking_download_ack script nor the publication_nonblocking_download_ack script is invoked.

If you are not using download acknowledgement, there is no server-side consequence of a download failure.