First, you don't want your site or pages on your site in Google's supplemental index, because once your pages in it, they will not get any good rankings in Google organic search result.
What is the common reasons why my pages are in the supplemental index?
1. Google thinks that the content on your page is not good. For instance, your article is too short.
2. Your content has the duplicate issue. They are similar to other pages on your site or other web-pages on other people's website on the internet.
3. Your content doesn't have any external link.
4. Or other mysterious reasons make Google don't like your content.
How to know how many pages of your site are in the supplemental index?
1. You need to know how many web-pages on your site has been indexed on Google search engine.
Run a search "site:www.yoursite.com" in Google, which will give you the result of the total indexed pages of yoursite.
To see the pages on your site in the main index, search with "site:www.yoursite.com -inallurl:www.yoursite.com". Alternatively，you can search for “site:www.yoursite.com/*”.
Then to get the number of pages in the supplemental index, you simple use the total number minus the number of pages in the main indexed.
To make the whole process easy, you can find some online tool which can help you calculate the supplemental index ratio directly.
There are a lot of sites offering this kind of tools. The one that I come across is http://www.seonlinelab.com/supplemental_index_ratio.php.
It may not be the best one, but it works for me. What you need to do is just to type in the domain name that you want to check and then it will show the result that you want to see. It is easy.
To prevent your pages or site getting into the supplemental index, you have to add content with high quality into your site and/or get high quality links to your site. High quality inbound links are those from sites with high Google page rank and with the “dofollow” tag. Usually new site tends to have more pages in the supplemental index. If that is the case for your site, what you can do just keep building your site and wait patiently. No matter what you do, patience is a virtue.
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