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Decrease of parallel query degree after upgrade from 11.2.0.3 to 12.1.0.2

edited Sep 10, 2015 10:01AM in Database DataWarehousing (MOSC) 8 commentsAnswered

Hi ,

After upgrade ( in-place)  from 11.2.0.3 to 12.1.0.2 on AIX (7.1) , oracle 12c  parallelize (auto dop) less then 11g !  why ?

in 11g AUTO DOP is between 1 and 30 , in 12c it is between 1 and 4 for almost all queries.

What's brakes parallelism in 12c ?

NB :

  • system + dictionary + fixed tables  statistics have been gathered after upgarde.
  • IO calibration has been performed after upgarde.

Best regards.

GD.

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