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ORA-01555 means Oracle was unable to get a consistent read -decreasing undo_retention should actuallly hurt you.
I would attempt export at a time the database is hit by less I/O activity.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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