Archive for November 9th, 2008

How Pagerank Affects Supplemental Index Listings

Sunday, November 9th, 2008

I am often asked about pages appearing in Google?s supplemental index and how it can be avoided.  Ultimately there are many factors that can influence whether a page is listed in the supplemental index; duplicate content issues, urls that return 404 errors and so on.

The first thing to be aware of is that the supplemental index is nothing to be afraid of.  In fact, it is normal for a site (particularly large sites) to have pages listed in the supplemental index.  The second point to note is that PageRank will have an effect on supplemental listings. Google evaluates a site?s importance largely by the quality of its back links.  If a site is deemed as particularly important, Google will tend to keep a greater percentage of its pages in its main index.

Getting Pages Out Of The Supplemental Index

Bearing the previous points in mind, the following actions can help to limit the number of pages seen in the supplemental index.

  1. Increase the number of high quality, relevant links to your site
  2. Ensure that all your pages have unique content and meta structures
  3. Set up 301 redirects for pages that have been renamed and ensure there are no canonical URL issues

This should help limit any issues on your site.  However, supplemental results are less of an issue than they once were. Late last year, Google began to develop new search technology that had the ability to search a greater number of pages.  Ultimately, what this means is that the more obscure pages that have been resigned to the supplemental index will have a greater chance of being seen in the SERPs.