Cardinality feedback to resolve a Cache buffers chains latch contention issue
Earlier, I blogged about resolving cache buffers chains latch contention in my earlier entry , in which, root cause was excessive index access due to Nested Loops join. Recently, we resolved another...
View ArticleDynamic_plan_table, x$kqlfxpl and extreme library cache latch contention
We had an interesting latch contention issue with a client database worth sharing. Client complained that they are seeing increased library cache latch contention in production with no logical...
View ArticleDOUG presentation: Why does optimizer hate my SQL?
I presented about Cost based optimizer explaining why some times CBO chose inefficient access plan, even though, there is an efficient plan in the search space. This entry is to post presentation...
View ArticleCOLLABORATE 2009 presentation: 11g performance new feature.
I just presented about Oracle 11g new features specific to performance in COLLABORATE 2009, Orlando Florida. You can download presentation and paper from here: 11g performance specific new features –...
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Exciting seminars in Dallas arena
If you live in Dallas area, there are two very important seminars coming up: Tanel Poder is presenting his Advanced Oracle troubleshooting seminar on September 9-11, 2009. . Jonathan Lewis presenting...
View ArticleIs plan_hash_value a final say?
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View ArticleRMOUG 2010: My presentations
It is very disappointing to me that I had to cancel my trip to RMOUG training days. I am sick and was not able to catch the flight due to that. But, I can always share my presentations here. I had two...
View ArticleQuery transformation – Part 1
Query transformation is a set of techniques used by the optimizer to rewrite a query and optimizer it better. Few optimization paths open up to the optimizer after query transformation. Some query...
View ArticleGroup by Hash aggregation
So, Here I was merrily enjoying OpenWorld 2010 presentations in SFO, I got a call from a client about a performance issue. Client recently upgraded from Version 9i to Version 10g in an E-Business...
View ArticleDOUG 2010 Presentation
You can find pdf version of the presentation here: Performance tuning – for developers . Feel free to ask questions in the comments. Thank you Mary Elizabeth Mcneely for the opportunity to talk in the...
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