Oracle Scratchpad

August 4, 2013

12c Histogram fixes

Filed under: 12c,Histograms,Oracle,Statistics — Jonathan Lewis @ 6:52 pm BST Aug 4,2013

I posted a couple of examples some time ago of oddities and boundary cases for frequency histograms on character columns. Part of the process of playing around with the 12c Beta was to re-run such cases to see if newer code made any difference. Looking at these examples, one was fixed (or improved, at least) the other wasn’t, so I’ve added a footnote to each and produced this little note to highlight the changes:

  • Effects of long characters strings in frequency histograms is better: improved.
  • When stats gathering misses the values that would cause endpoint_actual_values to be collected: no change.

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