rhevm-upgrade fails to upgrade to RHEV 3.2 due to a database failure.

Issue

• rhevm-upgrade fails to upgrade to RHEV 3.2 due to a database failure.

# rhevm-upgrade 
During the upgrade process, RHEV Manager  will not be accessible.
All existing running virtual machines will continue but you will not be able to
start or stop any new virtual machines during the process.

Would you like to proceed? (yes|no): yes
Stopping ovirt-engine service...                     [ DONE ]
Stopping DB related services...                      [ DONE ]
Cleaning async tasks...                              [ DONE ]
Pre-upgrade validations...                           [ DONE ]
Backing Up Database...                               [ DONE ]
Rename Database...                                   [ DONE ]
Updating rpms...                                     [ DONE ]
Updating Database...                                 [ ERROR ]

 **Error: Upgrade failed, rolling back**
 **Reason: Error: Database update failed**

Restoring CA...                                      [ DONE ]
Restoring Database...                                [ DONE ]
Rolling back rpms...
Starting ovirt-engine service...                     [ DONE ]
Error: Upgrade failed.