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An introduction to collectl
Some of you may have seen on twitter that I was working on understanding collectl. So why did I start with this? First of all, I was after a tool that records a lot of information on a Linux box. It can also play information back, but this is out of scope of this introduction.…
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Oracle RAC SIG presentation tips
Yesterday I proudly presented a one hour training class about upgrading to Oracle 11.2 RAC at oracleracsig.org. This was the first time I presented using this facility and thought it might be useful for others to learn about the procedures and hopefully encourage other speakers to follow suit. It’s really straight forward and there is…
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So you don’t see any disks when trying to install ASM?
This is a post that highlights the difference between operating systems, but also the fact that sometime it is hard to break out of a habit once you got used to it. My background is that of a Linux enthusiast, even though I equally like Solaris and AIX but I have a little less exposure…
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Compiling iozone for Solaris 10 on SPARC
I have started working with ZFS and its various ways of protecting disks from failure. It’s a low end setup at best, where a JBOD is used as an extension to a M-series server. Many JBODs come with SAS connectivity only, and no on-board intelligence so a host based solution has to be chosen to…
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Using Connection Manager to protect a database
I have known about Oracle’s connection manager (CMAN) for quite a while but never managed to use it in anger. In short there was no need to do so. Now however I have been asked to help in finding a solution to an interesting problem. A long story short is that access to databases has…
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Open VPN for the Road Warrior
UPDATE I have updated the post on 05-DEC-2013 to be relevant for openvpn-2.2.2-9.5.1.x86_64 on OpenSuSE 12.3. Instead of Xen I switched to KVM as it was easier to implement. I left the by now outdated versions of the Oracle software as they were, they don’t matter. The Xen “virtual machine” is called domU, KVM calls…
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Additional date for my Grid Infrastructure seminar in the UK
I was very pleasently surprised that Oracle University are offering another day for my “Grid Infrastructure and Database High Availability Deep Dive” seminar. In addition to the immenent seminars in June (I blogged about them earlier), this one is in London, England. For anyone interested, here is the link: http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getCourseDesc?dc=D70365_1439069&p_org_id=28&lang=US The date has been set…
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Tuning Log and Trace levels for Clusterware 11.2
With the introduction of Clusterware 11.2 a great number of command line tools have either been deprecated ($ORA_CRS_HOME/bin/crs_* and others) or merged into other tools. This is especially true for crsctl, which is now the tool to access and manipulate low level resources in Clusterware. This also implies that some of the notes on Metalink…
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A more user friendly multipath.conf
Update The below described changes to the device uid, gid and mode have been deprecated with RHEL6/OL 6. Back to udev rules… See http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/pdf/DM_Multipath/Red_Hat_Enterprise_Linux-6-DM_Multipath-en-US.pdf for more information During some recent work I did involving a stretched 11.2.0.2 RAC for a SAP implementation at a customer site I researched TimeFinder/Clone backups. As part of this exercise…
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How to use the RAC FAN Java API
I researched an interesting new feature available with Oracle 11g R2, the so called RAC FAN API when writing the workload management chapter for the RAC book. The RAC FAN API is documented in Oracle® Database JDBC Developer’s Guide, 11g Release 2 (11.2) available online, but when it came to the initial documentation following the…
