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The transaction log includes which of the following?

  • A.The before-image of a record
  • B.The after-image of a record
  • C.The before and after-image of a record
  • D.The essential data of the record

Answer: D

Correct answer: The essential data of the record

A transaction log records the essential data of each transaction: its identifier, the time, the type of action, and the data affected. The before and after images of changed records are held in the database change log, which is what a rollback or rollforward actually replays.

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