Author Archives: marcel

New Blog

Posted on September 21, 2016 by marcel

Hi all, as you have probably noticed, there hasn’t been a lot of activity on this blog for some time now. I have been working on a new blog on which I will post as of today. See http://blogs.vandewaters.nl/tech for … Continue reading →

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Oracle Database Appliance – Problem Replacing Shared Disk (2.4)

Posted on May 23, 2013 by marcel

As with all systems, a disk failure can happen and so we had a failing disk on one of our ODA’s. As mentioned in the ODA documentation, replacing a disk is easy and OAK does everything for you. Actually it … Continue reading →

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Oracle Database Appliance – /opt filling up

Posted on May 23, 2013 by marcel

Last time we had the /opt filesystem on a couple of ODA nodes filling up. It turned out that the OS Watcher archive directory structure (/opt/oracle/oak/osw/archive) contained lots of old files that should have been cleaned by OSWatcher. When OSWatcher … Continue reading →

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ORA-29283: invalid file operation using UTL_FILE.FREMOVE

Posted on March 13, 2013 by marcel

I’ve been breaking my head over a problem I had with the UTL_FILE.FREMOVE command trying to remove a file created by another (not oracle) process. On *nix command line, logged in as user oracle (same as database) I’m able to … Continue reading →

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ORA-600 [kkpo_rcinfo_defstg:objnotfound] on a 11.2 RAC instance

Posted on January 11, 2013 by marcel

RECOMMENDATION: Set the deferred_segment_creation parameter to FALSE for 11.2 RAC databases! Recently our monitoring picked up an ORA-600 from the alertlog of one of our 11.2 RAC instances. ORA-00600: internal error code, arguments: [kkpo_rcinfo_defstg:objnotfound],[87421], [], [], [], [], [], [], … Continue reading →

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ORA-19809: limit exceeded for recovery files

Posted on January 9, 2013 by marcel

In our cloning procedures we use the RMAN “DUPLICATE” command for duplicating databases. This all went fine for a long time until one moment we start getting errors during the duplication process (from the point where media recovery gets started). … Continue reading →

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Oracle Database Appliance – /boot filling up

Posted on December 20, 2012 by marcel

After the installation of the ODA bundle patch 2.4.0.0.0, the /boot filesystem on the ODA nodes was filled up to 84% (16 MB of 99 MB was free) and so Oracle Enterprise Manager started sending warnings about the default 80% … Continue reading →

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Determine versions of connected Oracle clients

Posted on October 8, 2012 by marcel

Last week I was trying to find a way to determine the version of the Oracle clients that are connected/connecting to databases from these databases. We cannot connect to each application server to figure out the used version and certainly … Continue reading →

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Cryptographic flaws in Oracle Database authentication protocol

Posted on September 26, 2012 by marcel

Recently a security researcher (Esteban Martinez Fayo) made the world aware of a problem with the O5LOGON Oracle database authentication protocol (used in 11g – 11.1 & 11.2). This problem, known as CVE-2012-3137, makes it relatively simple for attackers to … Continue reading →

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Linking Oracle BBED in 11g

Posted on September 6, 2012 by marcel

Warning: I use the Oracle Block Browser and Edit tool (bbed) for studying the internal structure of database blocks. Be very careful using the tool, you can destroy blocks using this tool so make sure you know what you are … Continue reading →

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