Oracle Scratchpad

May 22, 2013

gather_plan_statistics – 2

Filed under: Oracle,Performance,Troubleshooting — Jonathan Lewis @ 12:40 pm BST May 22,2013

Some time ago – actually a few years ago – I wrote a note about the hint /*+ gather_plan_statistics */ making some informal comments about the implementation and relevant hidden parameters. I’ve recently discovered a couple of notes from Alexander Anokhin describing the feature in far more detail and describing some of the misleading side effects of the implementaiton. There are two parts (so far): part 1 and part 2.

 

1 Comment »

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