Whether you can safely re-run the upgrade depends on when the failure occurred in the upgrade process. If the failure occurs while the message: “Starting to upgrade Adaptive Server” is displayed, it is safe to re-run the upgrade program.
Try to fix the problem that caused the upgrade to fail.
Run the upgrade again.
If the upgrade fails:
Before returning the message “Setting upgrade version to 12.5”, you may need to restore your latest database backup, and restart the upgrade.
After returning the message “Setting upgrade version to 12.5”, it is not necessary to restart the upgrade. The installation utility considers the upgrade to be complete.
Also, it is not necessary to restore a database from a backup unless that database failed during the upgrade.