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ORA-01555 means an UNDO entry got overwritten and was not longer available when export utility needed it.
undo_retention should be set to a value at least as large as the expected running time of your transaction -in this case your export session.
undo tablespace should be large enough to cope with the amount of undo generated during whatever value you have set as undo_retention.
My suggestion would be to attempt export again 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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