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Thinking Clearly About Performance, revised to include Skew
I’ve just updated the “Thinking Clearly” paper to include an absolutely vital section that was, regrettably, missing from the first revision. It’s a section on the subject of skew.I hope you enjoy....
View Article12c Hybrid Hash Distribution with Skew Detection / Handling
Oracle 12c introduces several new features in the area of Parallel Execution. Over the next couple of weeks I attempt to publish more about them - Jonathan Lewis for example already published a note...
View Article12c Hybrid Hash Distribution with Skew Detection / Handling – Failing
This is just an addendum to the previous post demonstrating one example (out of many possible) where the join skew handling feature fails. The test case setup is the same as in the previous post.As...
View ArticleParallel Execution Skew – 12c Hybrid Hash Distribution With Skew Detection
Since Parallel Execution Skew is a common problem that can severely limit the scalability of Parallel Execution (see my previous article for a demonstration), Oracle has introduced a new feature in 12c...
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