ORA-38869: datafile string has been restored from an RMAN backup with undo block compression.
Cause: Flashback Database could not flash back the database because a file was restored from an RMAN backup with undo block compression, and the Flashback target was to a time when the missing undo may be needed to open the database.
Action: Restore an earlier backup of the file and retry the command or Flashback to a later time.
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ORA-38869datafile string has been restored from an RMAN backup with undo block compression.