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When a transaction modifies the database, Oracle copies the original data before modifying it. The original copy of the modified data is called

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When a transaction modifies the database, Oracle copies the original data before modifying it. The original copy of the modified data is called

(a) Undone Data

(b) Archive Data

(c) Redo Data

(d) Undo Data
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Right choice is (d) Undo Data

The best I can explain: Before transaction happen the Oracle kept the files in Undo Data to overcome form any failure.
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