RE: Oracle Performance on VMWare

From: Johnson, William L (TEIS) <"Johnson,>
Date: Fri, 2 Jan 2009 14:40:39 -0500
Message-ID: <>

I believe I have seen conversations related to the comment I am about to make, but make sure you check on licensing requirements. Unless Oracle recently changed their policies, you have to license the entire source machine for Oracle - even if you are only running a 1 CPU vmware on top of 8 processors under the covers. This can be a costly mistake if you are audited...

From: [] On Behalf Of Andre van Winssen Sent: Friday, January 02, 2009 2:35 PM
To:;; Subject: RE: Oracle Performance on VMWare

There's webcast from Vmware on database performance. with useful up to date info They claim that overhead of vmware is dropping to only a few percent in the upcoming releases.

My experience with vmware is only on non-production databases. If there would not be a certification issue with Oracle then I would recommend it for a lot of production databases.


From: [] On Behalf Of Allen, Brandon Sent: vrijdag 2 januari 2009 18:42
To:; Subject: RE: Oracle Performance on VMWare

Hi Jon,

Could you please provide more details on the bad performance you've seen with Oracle on VMWare? I've tested performance with 64-bit Oracle on OEL 4 & 5 both running on VMWare ESX 3.5 and performance was just as good on VMWare as it was on bare metal. I've also implemented a production environment in this configuration and another one running Oracle App Server 10g on VMWare with excellent performance as well. Maybe you were testing on an older version of VMWare, or VMWare Server instead of ESX, or had some misconfiguration or bug that was causing problems? For example, I had horrible performance when I ran 32-bit OEL4 on 64-bit VMWare, but when I switched to 64-bit OEL4, performance was great.

Here is a good article about Oracle on VMWare (maybe a wee bit biased given the source):

No, I don't work for VMWare, and I don't have extensive experience with it - only about 6 months, but so far, so good in my experience.


From: [] On Behalf Of Crisler, Jon Sent: Wednesday, December 31, 2008 11:18 AM Subject: RE: db_recovery_file_dest_size
Virtualization is pretty cool and has its place, but it has to be used wisely. High stress mission-critical environments that I would not hesitate to put on any other vendors hardware or OS, including RH Linux, IMO should never be put under VMware...performance is so bad. My findings are that production databases just don't belong on VMware unless the application is really small. You really hit the nail dead-on- its got to be low stress (i.e. light activity). Although performance is my big complaint, reliability seems to be fine.

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Received on Fri Jan 02 2009 - 13:40:39 CST

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