Before beginning the upgrade, if you have been using Data Validator, it is recommended that all jobs should be completed because Data Validator creates tables for each job. If there are any changes to the table structures, these changes are often difficult to apply. It is also recommended that you delete any failed jobs before upgrade. Ensure there are no tables with the prefix VTL in the database. If you leave failed jobs in the system, a significant amount of tablespace might be consumed.