Certification Matrix points to the tested & recommended configurations for Oracle software - here eg: Fusion Middleware Suite; this might not just mean supported environment though.
* For information on Java SE (J2SE) End of Life, refer to My Oracle Support Doc ID 952075.1 on https://support.oracle.com/.
* If an Oracle product has been certified against and is supported on a version of RedHat Enterprise Linux (RHEL), it is automatically certified and supported on the corresponding version of Oracle Enterprise Linux (OEL). (e.g., RHEL4->OEL4, RHEL5->OEL5).
* If a product is supported and certified on OEL or RHEL, it is also certified and supported in the virtualized installation of the same version of OEL or RHEL running on Oracle VM. (e.g. OEL4 -> OEL4 on Oracle VM, OEL5 -> OEL5 on Oracle VM, RHEL4 -> RHEL4 on Oracle VM, RHEL 5 -> RHEL5 on Oracle VM). Oracle recommends using latest updates levels and OVM versions available.
* Every Oracle product that is certified on Windows or Solaris means it is also certified and supported when running on Windows or Solaris in a virtualized environment with Oracle VM as long as the Windows or Solaris OS is supported with Oracle VM.
Certification matrix for Oracle Fusion Middleware 11g
Certification matrix for Oracle Fusion Middleware 10g