If the upgrade process fails, the installation program displays
error messages.
Once you start Adaptive Server on the new version, you
cannot start Adaptive Server on the earlier version. Attempts to
do so result in having to restore from backups.
If You Can Identify the Cause of the Upgrade Failure
If the error logs or messages clearly indicate the cause of failure, and you are confident that your databases have not been damaged, you can attempt to fix the problem and immediately re-run the upgrade.
Recovering from a Failed Upgrade
Upgrade issues may be due to a failure to upgrade an individual database, or a failure to complete configuration changes after all databases have been upgraded.