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  • The cause for and against the Exadata simulator

    I am on my way back from the best UKOUG conference I ever attended, unfortunately a lot earlier than planned. Before I start forgetting all these great moments it is time to write them up. To make use of James Morle’s words: if you weren’t there, you lose. I couldn’t agree more! The Oak Table…

  • Getting started with Xen virtualisation on Ubuntu 11.10

    After a long time and lots of problems I decided to abandon openSuSE 11.4 and its xen implementation in favour of the PVOPS kernel and a different distribution. It’s been difficult to choose the correct one for me, for now I’m working with Ubuntu 11.10. One reason is that it’s said to be user friendly,…

  • Installing OEM 12c agents in RPM format

    One of the questions I have always asked myself revolved around: “why doesn’t Oracle package certain software as an RPM on Linux?” Well this question has recently been answered in the form of the Oracle 12c agent. It IS possible to use an RPM based installation, although it doesn’t make 100 use of RPM. I…

  • Simplified GNS setup for RAC 11.2.0.2 and newer

    One of the main problems I have seen with GNS (Grid Naming Service) installations was that you couldn’t really see if your DNS and DHCP configuration was correct until it’s been too late. This has been addressed, but it’s little known. There are a number of checks you can run before starting Oracle Universal Installer,…

  • Installing FreeNX on OpenSuSE 11.4

    After reading an article in one of my favourite computer magazines about FreeNX and NoMashine’s NX I was very interested to get this to work. Also, google are using NX for some developers-and if a technology is good enough for google than it can only be good enough for me as well. Unfortunately there wasn’t…

  • An interesting problem with ext4 on Oracle Linux 5.5

    I have run into an interesting problem with my Red Hat 5.5 installation. Naively I assumed that ext4 has been around for a long time it would be stable. For a test I performed for a friend, I created my database files on a file system formatted with ext4 and mounted it the same way…

  • Troubleshooting Oracle agent 12.1.0.1.0

    As you may have read on this blog I recently moved from Oracle Enterprise Manager 11.1 GRID control to the full control of the cloud-12.1 has taken its place in the lab. I also managed to install agents via self download (my OEM is x86 to reduce the footprint) on a 2 node 11.2.0.3 cluster:…

  • Move the EM12c repository database

    I have made a little mistake creating a RAC database for the OEM 12c repository-I now need a little more lightweight solution, especially since I’m going to do some fancy failover testing with this cluster soon! An 11.2.0.3 single instance database without ASM, that’s what I’ll have! Now how to move the repository database? I…

  • The tale of restoring the OCR and voting files on Linux for RAC 11.2.0.2

    As part of a server move from one data centre to another I enjoyed working in the depths of Clusterware. This one has been a rather simple case though: the public IP addresses were the only part of the package to change: simple. One caveat though was the recreation of the OCR disk group I…

  • The art of getting security right-an observation

    A number of high-profile hacks recently (and not so recent) has caught my attention. Well I thought, not such a big problem-I don’t have a PS3 and hence don’t have an account that can be hacked. I was still intrigued that the hackers managed to get hold of the passwords. I may be wrong here,…