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It’s a mixed bag and the jury is still out.
The Google index makes Google’s job easier. The idea is that you create a file specifically for Google to use. In that file you list all of the links in your site you want Google to index, AND you include the title and when the pages was last updated by you.
Google then only looks at that page. If it sees you have updated a page it will only need to look at that one page.
Until now, Google has crawled through web sites looking for new content. It might hit 20 of your pages in each crawl regardless of if/when they were last updated. If it sees no changes it will reduce the frequency of visits, but if it sees a lot of change it will increase the frequency and depth of visits.
Google says you help us and we’ll help you, so if you help them avoid crawling unchanged pages they’ll be more focused on crawling the ones they know in advance are new because you’ll identify them in this special code.
There is no evidence this works to your advantage and potentially it could hurt you if you are not making lots of changes. This is usually something I discuss and work through as part of SEO consulting. You’d need to /want to integrate this page with your content management system to that the Google Index file is dynamically generated and updated as your content changes.
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