The installation guide lists the following supported databases:
Oracle 10g Standard Edition Release 2 (10.2.0.1.0)
Oracle 10g Enterprise Edition Release 2 (10.2.0.1.0)
Oracle 11g Standard Edition
Oracle 11g Enterprise Edition
http://pubs.vmware.com/vcloud-director-1-0/install_config_guide/r_prereqs.html
