ORA-23402: refresh was aborted because of conflicts caused by deferred txns

Cause : There are outstanding conflicts logged in the DefError table at the materialized view's master.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Resolve the conflicts in the master DefError table and refresh again after the table is empty. Alternatively, refresh with refresh_after_errors set to TRUE, which will proceed with the refresh even if there are conflicts in the master's DefError table. Proceeding despite conflicts can result with an updatable materialized view's changes appearing to be temporarily lost (until a refresh succeeds after the conflicts are resolved).

update : 30-04-2017
ORA-23402

ORA-23402 - refresh was aborted because of conflicts caused by deferred txns
ORA-23402 - refresh was aborted because of conflicts caused by deferred txns

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