Oracle Scratchpad

August 9, 2013

12c Join Views

Filed under: 12c,Oracle,Performance,Tuning — Jonathan Lewis @ 6:36 pm BST Aug 9,2013

There are a few posts on the blog describing problems with updatable join views or, to be more precise, join views which were key-preserved but which the optimizer did not recognize as key-preserved. Some scenarios are addressed in 12c:

  • Constant involved in key-preservation fixed
  • Key-preservation ensured by aggregation – fixed
  • Analytic view update – still not legal / handled (and still illegal in 19.3)

1 Comment »

  1. […] There are a couple of variations to the uniqueness strategy that fail in some versions of Oracle, and I’ve got a short list of tests of recent examples that used to fail in earlier versions of Oracle at this URL. […]

    Pingback by Updatable Join Views | Oracle Scratchpad — November 1, 2019 @ 12:24 pm GMT Nov 1,2019 | Reply

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