Checking Details
Check whether the RDB file exists in the source instance.
Fixing Methods
If the RDB file does not exist, you need to generate an RDB backup for the source instance before starting the migration task.
2. At the top of the Instance List page on the right, select a region.
3. In the instance list, locate the target instance.
4. Click the target instance ID to go to the Instance Details page.
5. Select the Backup and Recovery tab and click Generate RDB.
6. In the pop-up dialog box, configure the relevant parameters and click Generate RDB.
7. Return to the Instance List page and wait for the backup to complete.
8. On the Validation Task page in DTS, click Revalidate. After the check is completed, click Start Now.