Re: Looking for pointers in troubleshooting -> RAC performance degradation (single instance is fine)
- From: K Gopalakrishnan <kaygopal@xxxxxxxxx>
- To: Pradeep.Chetal@xxxxxxxxxxxxxx
- Date: Fri, 25 Dec 2009 00:17:29 -0600
Pradeep,
This might be a shot in the dark, but with a shotgun, you might hit some
target :) In short this looks like an application issue, (or RAC amplifying
the application noise).
Treat gc buffer busy (and gc current busy) as you treat the buffer busy
waits (or read by other session waits) and tune the storage for the segments
accordingly. Techniques like MINIMIZE_RECORDS_PER_BLOCK at segment level or
hash partitioning will yield great results.
If you can post the relavant parts from the AWR we can offer a better
solution :)(
Happy Holidays and Happy New Year 2010.
Best Regards,
K Gopalakrishnan
Oracle Database 10g Real Application Clusters Handbook
http://www.amazon.com/gp/product/007146509X/
Oracle Wait Interface: A Practical Guide to Performance Diagnostics & Tuning
http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/
On Thu, Dec 24, 2009 at 7:28 AM, Pradeep Chetal <
Pradeep.Chetal@xxxxxxxxxxxxxx> wrote:
>
>
> Folks,
>
>
>
> We have an app that is running well in single instance but when put on a
> 2-node or 3-node RAC, we see pretty much similar performance. However, if
> the CPU time is 55-60% in single instance, it becomes 20% in 3-node RAC and
> top-5 itmed events become..
>
>
>
> "gc buffer busy", "gc current block busy", "enq: TX- index contention
>
>
>
> Any help in what to look for will be greatly appreciated.
>
>
>
> Thanks,
>
>
>
> -- Pradeep
>
> *Pradeep Chetal*
> Sr. Director - Infrastructure Architecture
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