how to check wich db is a vCenter using

To know wich ODBC sources is being used by a vCenter and Update Manager, one needs to check the registry of the windows machine.
After you know the ODBC source, you can open it and see wich db and witch server it is pointing to.

HKEY_LOCAL_MACHINE\SOFTWARE\VMware, Inc.\VMware VirtualCenter\DB

the same for the update manager. 


source: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003928