Each logical-log record contains a time stamp, a 4-byte integer. During a restore, the database server uses these time stamps to determine where to start the logical restore.
For fuzzy operations, the database server uses the same time stamp for both the log record and disk page. During fast recovery, the database server compares the disk-page and log time stamps to determine which log record to apply. After fast recovery applies the log record to the dirty page, it copies the time stamp from the log record to the time stamp for the disk page.
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