Cause:
- XML db component is mandatory in 12c. During an upgrade to 12c, XML db
component is installed. Downgrade from 12c removes the installed XDB components.
- The XDB deinstall script called during the downgrade is prvtnoqm.plb which drops the XDB user with CASCADE, but does not consider XDB objects under SYS and PUBLIC schema.
component is installed. Downgrade from 12c removes the installed XDB components.
- The XDB deinstall script called during the downgrade is prvtnoqm.plb which drops the XDB user with CASCADE, but does not consider XDB objects under SYS and PUBLIC schema.
Solution:
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