ORA-30755: error during expansion of view hierarchy



ORA-30755: error during expansion of view hierarchy..

Answer / guest

Cause: There was an error while trying to expand a view
hierarchy. This could be due to invalid subviews (or
subviews with errors)

Action: Ensure that all subviews are valid e.g. alter view
... compile and retry the operation.

Please add more information about this Error

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