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in this session letamp;#39;s learn about undo data and redo data again these concepts will be really helpful when I teach the Oracle architecture okay so letamp;#39;s understand these concepts what is an undo in simple terms undo means whatever the action we have performed just reversing that action is a undo right example you have deleted text in a Word document if you do an undo what will happen whatever the deleted text will reappear right thatamp;#39;s all in the same way Oracle also records all the data that is about to change yes before making any change Oracle will take the data and record that that that data is called as a undo that why is it used in case if you have to rollback that undo data will be used to rollback okay here letamp;#39;s see an example here we have two rows whenever we perform an insert into this table the Oracle database maintained say undo data what is an undo data for an insert it is delete obviously right if we perform this insert operation a third r
