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Upgrading EM12c Release 1 (12.1.0.1) to 12c Release 2 (12.1.0.2)
I recently upgraded EM 12c version 12.1.0.1 to EM 12c Release 2 (12.1.0.2) on a Linux 64 bit platform. Here are few of the things to keep in mind and some notes I made which may be helpful to others...
View ArticleView Data Volume Estimates
When the optimizer has to estimate the data volume (the BYTES column in the plan output), it usually bases this information on the column statistics, if applicable and available (think of complex...
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11.2.0.4 new features and a OPTIMIZER_DYNAMIC_SAMPLING change
As of 27th August 2013, 11.2.0.4, the final release of 11GR2 was made available – a new features document is available . I will give a quick bullet list of the new features and then discuss one very...
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 New Optimizer Features
Besides the officially available information about new optimizer features in 12c it is always a good idea to have a look at the internal optimizer parameters that show what features are enabled when...
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...
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