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Which of the following fields does the update log record have?(a) Transaction identifier(b) Data-item identifier(c) Old value(d) All of the mentionedI had been asked this question during an interview.This key question is from Recovery and Atomicity in chapter Recovery System of RDBMS

Answer»

Right option is (d) All of the mentioned

For explanation: An update log record describes a single database write. It has FOUR FIELDS in it. The update log record has a TRANSACTION IDENTIFIER, data-item identifier, old value, NEW value.



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