Enable hyperthreading for virtualized Oracle 11gR2 database (OEL57 64-bit)?

We are virtualizing our Oracle 11gR2 databases (running on OEL57 64-bit) on Vmware 5.1. I've read information at various locations that hyperthreading is not recommended for Oracle 11g database. One example is here, however, I seen many more:
http://bryangrenn.blogspot.com/2011/08/hyperthreading.html
My issue is that Vmware themselves recommends enabling hyperthreading for virtualized Oracle databases in their Oracle Databases on VMware Best Practices Guide.
Does anyone have any practical experience with this issue that can be shared? What are the advantages and disadvantages of enabling hyperthreading for our virtualized Oracle 11gR2 on OEL57 64-bit virtual machines
Thanks, Fred
Edited by: 995752 on Mar 30, 2013 11:26 AM

995752 wrote:
We are virtualizing our Oracle 11gR2 databases (running on OEL57 64-bit) on Vmware 5.1. I've read information at various locations that hyperthreading is not recommended for Oracle 11g database. One example is here, however, I seen many more:
http://bryangrenn.blogspot.com/2011/08/hyperthreading.html
If you read the comments on that blog you will see that the results are highly dependent on the type of CPU.
The effects can also be dependent on the nature of the workload: you may have CPUs that are fine with an OLTP workload, but don't scale as you might hope with a DW workload.
Regards
Jonathan Lewis

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    According to Oracle documentation, database certification and support for Oracle 11gR2 under Oracle Linux starts with 11.2.0.3.
    I was wondering if this might have anything to do with the i386 software prerequisites. Speaking of Oracle 11gR2 x86_64, the need for i386 libraries was removed with 11gR2 11.2.0.2. Or in other words, one can go straight to 11.2.0.2 without the need to install any 32-bit libraries.
    Under Oracle Linux 5 x86_64, the "oracle-validated" package triggers the installation of several i386 packages. Under Oracle Linux 6 x86_64, the oracle-rdbms-server-11gr2-preinstall package uses x86_64 only. Under Oracle Linux 6, i386 changed to i686.
    For what it's worth, I have installed Oracle 11gR2 database 11.2.0.1 under Oracle Linux 6.1 to 6.3, both x86_64, simply by using the oracle-rdbms-server-11gr2-preinstall package, and so far have not noticed any problems. Is there some information available, why 11.2.0.1 (x86_64) should not be used or is not certified for Oracle Linux 6 (x86_64)?
    Thanks.

    I was afraid of that. Since the question is Oracle Linux 6 specific, I thought I'd try my luck here, thinking that if I get an answer, then probably here. Maybe it was not very realistic to get an answer anyway.
    For what it's worth. Using "oracle-validated" under Oracle Linux 5, and "oracle-rdbms-server-11gR2-preinstall" under Oracle Linux 6, I was able to install Oracle 11gR2 11.2.0.1 just fine, both platforms x86_64 and 32-bit. I have not found any operational issues yet and it seems to run perfectly well.
    The only trouble I had was with Grid Infrastructure 11.2.0.1, and here 11.2.0.3 is indeed required for it to install. I made a custom patch, just a few lines and after that 11.2.0.1, both x86_64 and 32-bit installed just fine and is fully operational.
    I'm though I could post the patch. I guess it might make those people happy who do not have access to Oracle support and download 11.2.0.3. The patch will allow them to use the 11gR2 OTN version and install it under Oracle Linux 6. It won't be certified, but it is good enough for the purpose of education.
    I'm closing the thread.

  • Ntp Server for Oracle 11gr2 (oracle clusterware) on HP-UX

    we are planning to configure a ntp server on Windows 2003 server for our Oracle 11gr2 RAC (2 nodes) on HP-UX but we have some issues to be clear. Following are the details for our environment.
    RAC : Oracle Clusterware (2 nodes)
    Database : 11gr2
    OS: HP-UX B11
    Hardware: HP Intergrity Blade Servers BL860c i2
    ntp server : HP Proliant
    if our ntp server fails how the both nodes will manage the time?

    if our ntp server fails how the both nodes will manage the time?Use NTP insure that all cluster nodes must be synchronized to the same time ,in 9i , 10g and 11gR2 Oracle Clusterware includes the Cluster Time Synchronization Service (CTSS) . On startup Clusterware checks for a NTP configuration, if found, CTSS goes into Observer mode. This means it will monitor the clock synchronization and report in the Oracle Clusterware alert log if it finds a problem. If it does not find a NTP configuration, CTSS will be active .
    Check
    http://docs.oracle.com/cd/E26996_01/E18548/html/manager_ntpconfig.html
    http://docs.oracle.com/cd/E23824_01/html/821-1454/time-20.html

  • How to configure Oracle Dataguard for Oracle 10g database

    Hi Friends,
    I would like to configuer Oracle Dataguard for my Oracle 10g Database.
    Please provide me the configuration document.(step by step guide)
    Regards,
    DB

    Hi
    Go throw below link. This would be help to configure ODG..,
    http://blogs.oracle.com/AlejandroVargas/2007/09/data_guard_physical_standby_im.html
    http://blogs.oracle.com/AlejandroVargas/2007/10/data_guard_broker_observer_and.html
    Thanks,
    Mayilselvan.S

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