OL

Can you use the UEK7 Linux kernel, or may you get some trouble?

Writing about a topic I have not much knowledge with is … no fun 🙂 But let me share this with you as one of my most trusted customers, Peter Lehmann, tested this and got trapped. The information being available was not crystal clear, and Peter‘s database did not start anymore when HUGEPAGES were enabled. So, the question is: Can you use the UEK7 Linux kernel, or may you get some trouble?

Where it all starts

Peter set up a new cluster with Oracle Linux 8.8 using an UEK7 kernel. And as …

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Oracle Database 19c is certified on OL9 and RHEL9

I know, many of you were asking several times already about the certification of the Oracle Database on Oracle Linux 9 and Red Hat Enterprise Linux 9. And originally I think an announcement was planned for Oracle Cloud World in Las Vegas. But certification mean that you really certify, and not just wave things through. We’ve done thorough testing, and some issues were found which needed to be fixed at first. Good news: Oracle Database 19c is certified on OL9 and RHEL9.

Certification Tab

You can check certifications quickly on MyOracle Support by yourself. …

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Oracle Linux (OL), Red Hat Enterprise Linux (RHEL) and CentOS

Oracle isn’t always evil. And I personally never understood why not everyb0dy is on Oracle Linux (OL) already. It’s free, it gets extremely well maintained. And some issues my customers saw with Red Hat Enterprise Linux (RHEL) were fixed with OL literally more than a year before RHEL did. No blame to anybody – but that is my experience when customers tell me about issues over the past two years. But what is the future of Oracle Linux (OL), Red Hat Enterprise Linux (RHEL) and CentOS? And why am I writing this blog post?

Oracle Linux (OL), Red Hat Enterprise Linux (RHEL) and CentOS

Photo by Brigitta Schneiter on

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Disable Transparent Hugepages on SLES11, RHEL6, RHEL7, OL6, OL7 and UEK2 Kernels

This blog post is not related to database upgrades and migrations. But still I think it is very useful for many customers operating on modern Linux systems.

Recommendation 

Support just published an ALERT strongly recommending to disable Transparent Hugepages on Linux systems. And the below information does not apply to RAC systems only but also to single instance environments.

Which Linux Distrubutions/Kernels are affected? 

  • SLES11
  • RHEL6 and RHEL7
  • OL6 and OL7
  • UEK2 Kernels

What are the Issues? 

I’m quoting MOS Note: 1557478.1 (ALERT: Disable Transparent HugePages on SLES11, RHEL6, RHEL7, OL6, OL7 and UEK2 Kernels):

Because Transparent HugePages are

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OEL6 and RHEL6 certification

Well, it took some time until Oracle Database 11.2.0.3 got finally certified on Oracle Unbreakable Linux 6 (OEL6) and RHEL6 (see the official announcement here). One really interesting change is that effective immediately, Oracle will provide its Red Hat compatible Linux binaries, updates and errata for free http://public-yum.oracle.com

Finally MOS now has been updated as well (please go to the CERTIFICATION tab):

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