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January 2013

Oracle 11gR2 RAC Installation on Oracle Linux 5

As promised in a recent post, I’ve updated the Oracle 11gR2 RAC on Oracle Linux 5 article. It now uses VirtualBox 4.2.6, rather than 3.2.8 as it was before, and Oracle Linux 5.8.

I’ve purposely left it as an 11.2.0.1 installation as you can get this from OTN without needing access to My Oracle Support (MOS). The process works just as well for 11.2.0.3 and I would recommend you use that if you do have access to MOS. Remember, if you are doing the RAC installation on Oracle Linux 6 you are going to need 11.2.0.3, so OL5 might be the right option if you are playing around with this at home with no access to MOS.

Cheers

Tim…

Oracle Linux and ESX hot add cpu and memory

I'm still quite new in Vmware ESX environment and features which I'm using now as my lab (curiosity of VMWare Guru Program).
This time I decided to test hot add CPU and memory functionality. It looks very interesting and in past years hot cpu / memory games where restricted to sophisticated hardware only - now everybody can test is at home.

My lab is basesd on Intel 4 cores and VM are running Oracle Linux 6.3 with or without Oracle Enterprise Kernel. Here are my findings:

Oracle Linux and ESX hot add cpu and memory

I'm still quite new in Vmware ESX environment and features which I'm using now as my lab (curiosity of VMWare Guru Program).
This time I decided to test hot add CPU and memory functionality. It looks very interesting and in past years hot cpu / memory games where restricted to sophisticated hardware only - now everybody can test is at home.

My lab is basesd on Intel 4 cores and VM are running Oracle Linux 6.3 with or without Oracle Enterprise Kernel. Here are my findings:

Tuning paramon.sql

I know no one really likes the term “tuning” these days, but it’s a short catchy word that gets the idea across. So I’ll just stick with it for the title of this post.

Note that this is one of those posts that’s not really supposed to be about how to solve a particular problem. It’s really just a story about a distraction that I ran into and I how I thought about getting around the issue and then ultimately resolving the root cause. Maybe you will find it instructive to see the process.

Secure Coding PL/SQL

I wrote a new presentation last year on secure coding with PL/SQL and presented it twice; once at a SIG in London and once in Oracles office in Edinburgh. This is a really interesting subject for me as i have....[Read More]

Posted by Pete On 14/01/13 At 07:43 PM

Blog formatting

I think I’ve finally gotten the blog formatting to be like I want … The syntax highlighter plugins were not good enough as I want very flexible output formatting (not just code snippets, but sqlplus script output) as below:

HAVING Cardinality

When performing aggregate GROUP BY operations an additional filter on the aggregates can be applied using the HAVING clause.Usually aggregates are one of the last steps executed before the final result set is returned to the client.However there are various reasons, why a GROUP BY operation might be somewhere in the middle of the execution plan operation, for example it might be part of a view that cannot be merged (or was hinted not to be merged using the NO_MERGE hint), or in the more recent releases (11g+) the optimizer decided to use the GROUP BY PLACEMENT transformation that deliberately can move the GROUP BY operation to a different execution step of the plan.In such cases, when the GROUP BY operation will be input to some other operation, it becomes essential for the overall efficiency of the execution plan preferred by the optimizer that the cardinality estimates are in the right ballpark, as it will influe

Compression

Originally published Jan 2013

Red Gate have asked me to write a few articles for their Oracle site, so I’ve sent them a short series on “traditional” compression in Oracle – which means I won’t be mentioning Exadata hybrid columnar compression (HCC a.k.a. EHCC). There will be five articles, published at the rate of one per week starting Tuesday (15th Jan). I’ll be supplying links for them as they are published.

Captain Support and Outlook.com…

This morning I was called because my mom’s email wasn’t working. As usual, no clear explanation of the issue was available. This sounds like a job for Captain Support!  The problem turned out to be Microsoft had switched her from the Hotmail interface to the Outlook.com interface. A quick explanation of the new interface and she bravely decided to stick with it, rather than switching back to the original Hotmail interface. I’m sure Captain Support will be needed a few times in the coming days… :)