ORA-12056: invalid REFRESH method

Cause: The NEVER REFRESH option may not be used under the following conditions:

* The materialized view is updatable

* The materialized view refreshes ON COMMIT

* Automatic refresh options are specified

Action: For updatable materialized views, reissue the SQL command using REFRESH FORCE, REFRESH FAST, or REFRESH COMPLETE. For read-only materialized views, reissue the SQL command using ON DEMAND.

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