ORA-32443
Cannot create the materialized view REFRESH FAST if the query references an unsupported external table
Cause
An attempt is being made to create the materialized view REFRESH FAST when the query references an unsupported external table.
Action
To enable FAST REFRESH, ensure the materialized view references a supported external table, such as an ORACLE_LOADER type external table created using DBMS_CLOUD.CREATE_EXTERNAL_TABLE() or DBMS_CLOUD.CREATE_EXTERNAL_PART_TABLE() in Oracle Cloud.