After each incomplete recovery, database should be opened with resetlogs.
In 9i and below, if database is need to be restored to time prior to resetlogs, different incarnation should be restored.In addition, since new log thread starts with number 1 after resetlogs, all previous backups become obsolete.
In 10g, this is not an issue anymore. RMAN can use any backup before or after resetlogs to recover Oracle database.No need to use different incarnation.
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