In my last post about large pages in 18.104.22.168 I promised a little more background information on how large pages and NUMA are related.
Background and some history about processor architecture
For quite some time now the CPUs you get from AMD and Intel both are NUMA, (more...)
Large Pages in Linux are a really interesting topic for me as I really like Linux and trying to understand how it works. Large pages can be very beneficial for systems with large SGAs and even more so for those with large SGA and lots of user sessions connected.
Some days are just too good to be true :) I ran into an interesting problem trying to install 22.214.171.124.0 Grid Infrastructure for a two node cluster. The storage was presented via iSCSI which turned out to be a blessing and inspiration for this blog post. (more...)
So this is a little bit of a plug for myself and Enkitec but I’m running my Grid Infrastructure And Database High Availability Deep Dive Seminars again for Oracle University. This time these events are online, so no need to come to a classroom at all.
Here is the short description (more...)
This might be something very obvious for the reader but I had an interesting revelation recently when implementing parallel_degree_limit_p1 in a resource consumer group. My aim was to prevent users mapped to a resource consumer group from executing any query in parallel. The environment is fictional, but let’s assume that it is (more...)
The annual conference held by the Oracle User Group in Norway has once again been just great. It was the second year I went and I have to admit that it was every bit as good as last year, and that’s holding a very high standard.
The combination of such (more...)
I had to think of @OyvindIsene, a great ambassador of the Norwegian Oracle User Group when I typed the heading for this post. Unlike him I have not actively been looking for new challenges but sometimes things just develop, and in my case that was a great turn of events. I (more...)
For quite some time now I am using ESXi 5 update 1 for my lab server and I’m very happy with it. In my lab environment I am not too picky what to run and do not worry about support too much. It’s not production!
One area of concern has been the support for Oracle’s own kernel: UEK or Unbreakable Enterprise Kernel. UEK comes in two editions, one based on 2.6.32, just like Red Hat’s kernel for Red Hat 6. The difference is that you can get UEK/1 (2.6.32.xxx) for Oracle Linux 5.x as (more...)
Although this post is primarily written for users of VMware Workstation 8 it is applicable for any RedHat 6 clone and adding disks with single path on the fly. Multipathing requires additional setup in dm-multipath or the vendor multipathing software which I won’t cover here. A quick hint though: you need to set disk.EnableUUID = “TRUE” in your VM’s config file for scsi_id to return a value.
The situation is common: you created a virtual machine and need more storage. Hopefully you created it using LVM which would allow you to add the new disk to an existing volume (more...)
So this is slightly off topic, as it doesn’t deal with anything directly related to Oracle, it’s more a reference to those who are using Supermicro boards like I do. The nice thing about professional hardware is that you do not need a keyboard or mouse, or even a monitor. The board I have comes with an IPMI interface, and has a KVM over IP ability. The interface can be accessed from a dedicated software or a web browser.
The suitable application to access your KVM is called IPMIView, and it’s available for MacOS, Linux and Windows.
Since I (more...)