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Limiting the Degree of Parallelism via Resource Manager and a gotcha

This might be something very obvious for the reader but I had an interesting revelation recently when implementing parallel_degree_limit_p1 in a resource consumer group. My aim was to prevent users mapped to a resource consumer group from executing any query in parallel. The environment is fictional, but let’s assume that it is possible that maintenance operations for example leave indexes and tables decorated with a parallel x attribute. Another common case is the restriction of PQ resource to users to prevent them from using all the machine’s resources.

This can happen when you perform an index rebuild for example in parallel to speed the operation up. However the DOP will stay the same with the index after the maintenance operation, and you have to explicitly set it back:

Optimal Oracle Configuration for Efficient Table Scanning (Part One)

I just got permission from The UK Oracle Users Group to reproduce my article series on optimising scans in Oracle. Part One is available here, Part Two will follow shortly after, and then Part Three will be a few weeks away, following its publication in the magazine. Enjoy!

Optimal Oracle Configuration for Efficient Table Scanning (Part One)

I just got permission from The UK Oracle Users Group to reproduce my article series on optimising scans in Oracle. Part One is available here, Part Two will follow shortly after, and then Part Three will be a few weeks away, following its publication in the magazine. Enjoy!

Hotsos Revisited 2013 – Presentatie materiaal

Hierbij nog dank voor allen die aanwezig waren bij de weer gevulde, informatieve & gezellige avond tijdens “Hotsos Revisited 2013″. Wij presentatoren hebben genoten van het ambiance. Hier ook nog voor degenen die graag het nog een keer willen nalezen het presentatie materiaal van Toon, Jacco, Gerwin, Frits en mij… Presentatie materiaal in alfabetische volgorde: …

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AMIS Masterclass – Two Day Masterclass with Oracle ACE Director James Morle

AMIS is spending a lot of effort keeping our people up-to-date with the latest knowledge needed to help our customers the best way we can. Traditionally we also always try to share our knowledge with customers and others, via social media or conferences, and while abroad learning from others at the same time. It is …

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Hotsos 2013 – From Unstructured to Structured…

It has been a while that I have been attending Hotsos, although that is how it feels. In 2011 I flew to Hotsos to see, among others presentations from Maria Colgan, but I ended up being sick the whole week while learning on my hotel room to enjoy American TV. In 2012 I skipped Hotsos …

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Oracle on AIX - where's my cpu time ?

This story begins couple of weeks ago when I was asked to look on performance problem for critical processes before go-live. There were differences between run times between different test systems and between runs with 10046 trace enabled or not.