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 DataThis question was posed to me in quiz.This is a very interesting question from Storing and Guarding the Data in division Oracle Database 11g Architecture Options of Oracle

When a transaction modifies the database, Oracle copies the original d

1.	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 DataThis question was posed to me in quiz.This is a very interesting question from Storing and Guarding the Data in division Oracle Database 11g Architecture Options of Oracle
Answer» 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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