Can Virtual Machin system make negative impact to the database performance?

Can Virtual Machin system make negative impact to the database performance?
I want to make a virtual machine system in my server and then install Oracle 10g database on the virtual machine system. But I am not sure if Virtual Machin system can make any negative impact to the database performance.
Thank you

The virtual machine software vendor must have certified and provided some performance figures like running Oracle on our VM would have a performance hit of n%. VMWare has such a figure published (8% if I recall correctly).
Besides, the load on physical server, apart from the virtual machine running, would also have the impact on performance.
Other factors would be
1. how quickly the host OS can cater to the guest OS with the RAM requirements (it would be good if you could pre-allocate RAM to VM)
2. with the assumption that you will be running an OS within OS, files on host OS forming the VM, should be pre-allocated in terms of space, avoiding runtime extentions.

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