The RedoLSN and the dirty-pages table supplied by the analysis pass are inputs to this routine. It starts scanning the log records from the RedoLSN point. For a redoable log record , a check is made to see if the referenced page appears in the dirty-pages table. If it does and if the log records LSN is greater than or equal to the RecLSN for the page in the table , then the page is accessed. If the page's LSN is found to be less than the log record's LSN, then the update is redone. Thus , RecLSN limits the number of pages which have to be examined.