Personal and Workgroup ArcSDE are only available as SQL-Server Express instances. Only Enterprise
is available with Oracle (and the other RDBMSes).
If you are using Personal or Workgroup, you don't have to worry about virtual host deployment, since
they're Direct Connect-only. Only Enterprise supports an a application server service.
If you do license Enterprise ArcGIS Server, you'd have to license an additional server host to run the
application server on a host other than the AGS host.
- V