In order to change the sql database password of RHEVM , you will need to download Microsoft SQL Server Management
Studio Express, here is the link:
http://www.microsoft.com/downloads/details.aspx?FamilyID=c243a5ae-4bd1-4e3d-94b8-5a0f62bf7796&displaylang=en
Now connect to the database using the windows authentication and expand the security tab.
Double-click the user sa and change its password to the one you want and Save and close the application.
Now, goto c:\program files\redhat\rhevmanager\service\dbscripts\
Edit the run_create_vdc_db.bat and then run_sync_config.bat, and check that the sa password is set to the one you entered on your last step
.
Let me know, if you have any trouble.