Learn in the textbookFailure Recovery
DefinitionA rollforward (ロールフォワード) is the operation that reapplies, in order, the updates kept in the log to a database from an earlier point, bringing it forward to its state just before the failure.
ExplanationWhen a disk breaks and data is lost, for example, the regularly taken backup is restored first, but that alone leaves out the updates made after the backup. The after-update values recorded in the log are then written in from oldest to newest, reproducing the results of the committed transactions.
AnalogyIt is like losing a spreadsheet file, opening the copy from the day before, and retyping everything entered since then by checking your notes.
Memory hookRoll forward means to roll ahead. Forward points ahead, which ties it to forward restoration.