Patent 8666964 was granted and assigned to Google on March, 2014 by the United States Patent and Trademark Office.
Determining a schedule for recrawling pages is disclosed. A crawling schedule that specifies a due date at which each page is to be crawled is determined according to a first scheme. A set of pages that includes one or more pages each of which has a due date that has passed is determined. The set of pages is ordered according to a second scheme.