Retrieval of data is done by using a ____:

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• The disk controller uses                  at each sector to ensure that the data is not corrupted on data retrieval.
• Which of the following option is use to retrieval of data?
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• Once the lower-level lock is released, the operation cannot be undone by using the old values of updated data items, and must instead be undone by executing a compensating operation; such an operation is called
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