| ERROR | refresh was aborted because of conflicts caused by deferred transactions |
| CAUSE | There are outstanding conflicts logged in the DEFERROR table at the materialized views master site. |
| ACTION | Resolve the conflicts in the master DEFERROR table and refresh again after the table is empty. Alternatively, refresh with REFRESH_AFTER_ERRORS, even if there are conflicts in the masters DEFERROR table. Proceeding despite conflicts can result in an updatable materialized views changes appearing to be temporarily lost, until a refresh succeeds after the conflicts are resolved. |