I get asked this same old question at every client site: Does Oracle support their databases on VMware?
Oracle Support has not certified any of their products on VMware. Not being certified does not mean that it is not supported. Historically, Oracle has not certified hardware platforms. They certify operating system distributions. Oracle will provide support until the problem is no longer reproducible on native hardware. If you ever get to this point, Oracle will ask you to pursue the problem with VMware support. The real question to ask is, what is VMware position on supporting Oracle products on VMware.
Here’s an excerpt of their Metalink ID:
Oracle has not certified any of its products on VMware virtualized environments. Oracle Support will assist customers running Oracle products on VMware in the following manner: Oracle will only provide support for issues that either are known to occur on the native OS, or can be demonstrated not to be as a result of running on VMware.
If a problem is a known Oracle issue, Oracle support will recommend the appropriate solution on the native OS. If that solution does not work in the VMware virtualized environment, the customer will be referred to VMware for support. When the customer can demonstrate that the Oracle solution does not work when running on the native OS, Oracle will resume support, including logging a bug with Oracle Development for investigation if required.
If the problem is determined not to be a known Oracle issue, we will refer the customer to VMware for support. When the customer can demonstrate that the issue occurs when running on the native OS, Oracle will resume support, including logging a bug with Oracle Development for investigation if required.
NOTE: Oracle has not certified any of its products on VMware. For Oracle RAC, Oracle will only accept Service Requests as described in this note on Oracle RAC 188.8.131.52 and later releases.You can access Oracle’s Support Position for Oracle Products Running on VMWare Virtualized Environments via MOS ID 249212.1.