Question: When the system recovers from a crash, it constructs an undo-list and a redo-list. Explainwhy log records for transactions on the undolist must be processed

When the system recovers from a crash, it constructs an undo-list and a redo-list. Explainwhy log records for transactions on the undolist must be processed in reverse order, while those log records for transactions on the redo-list are processed in a forward direction.

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