Author Archives: marcel

New Blog

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

Posted in Uncategorized | Leave a comment

Oracle Database Appliance – Problem Replacing Shared Disk (2.4)

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

Posted in Database Appliance | Tagged , , , , , , , , , , , | Leave a comment

Oracle Database Appliance – /opt filling up

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

Posted in Database Appliance | Tagged , , , , , , | 1 Comment

ORA-29283: invalid file operation using UTL_FILE.FREMOVE

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

Posted in Database | Tagged , , , , , , , , , | Leave a comment

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

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

Posted in RAC | Tagged , , , , , , , , , | 1 Comment

ORA-19809: limit exceeded for recovery files

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

Posted in Database | Tagged , , , , , , , | Leave a comment

Oracle Database Appliance – /boot filling up

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

Posted in Database Appliance | Tagged , , , , , , , , | Leave a comment

Determine versions of connected Oracle clients

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

Posted in Database | Tagged , , , , , , | Leave a comment

Cryptographic flaws in Oracle Database authentication protocol

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

Posted in Database, Security | Tagged , , , , , , , , , , , , , , , , , , , , , , , | 12 Comments

Linking Oracle BBED in 11g

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

Posted in Database, Uncategorized | Tagged , , , , , | Leave a comment