Oracle Error Message
ORA-32315: REFRESH FAST of “string”.”string” unsupported after mixed DML and Direct Load
Reason for the Error
One or more of the materialized view logs on the detail tables referenced by the specified materialized view omits the sequence number option. Such a log cannot be used to refresh a materialized view after deletes or updates and direct path insert.
Solution
Use REFRESH COMPLETE. Note: you can use the DBMS_MVIEW.EXPLAIN_MVIEW() API to determine which materialized view logs omit the sequence number option.