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ORA-00377:

Frequent backups of file string causing write operation to stall
Cause: Backups are occurring too frequently on this file. Each time a new backup is started for a file, any writes which have been previously issued (but not completed) have to be re-issued. If hot backups are started very, very frequently, it is possible that some writes will be re-issued repeatedly and never complete.
Action: Increase the interval between begin hot-backup commands for this file.