| ERROR | unknown materialized view type: string |
| CAUSE | A fast refresh is being performed on a materialized view of an unknown or unsupported type. |
| ACTION | Check all_mviews and ensure that the materialized view being refreshed a valid materialized view. |
| ERROR | unknown materialized view type: string |
| CAUSE | A fast refresh is being performed on a materialized view of an unknown or unsupported type. |
| ACTION | Check all_mviews and ensure that the materialized view being refreshed a valid materialized view. |