Over the past several days I have noticed a bunch of SEOs sharing information about the Google supplemental index and talking SEO strategies related to it. Just as a PSA, the Google supplemental index has not been in existence for a dozen or so years now.
Today, in 2022, there is no such thing as the Google Supplemental Index.
Yes, pre-2010, Google maintained two indexes for technical reasons. The main index was updated more frequently and faster and the supplemental index was for pages of lower importance that didn't need to be updated as quickly. Generally, pages in the main index would rank higher in Google Search than pages in the supplemental index. And Google would generally only rank pages in the supplemental index if it couldn't find good matches in the main index.
In fact, Google use to label search results that came from the supplemental index, as such. Here is a screenshot I posted back in 2007 with this label:
In December 2007, Google started to hide the supplemental index label, stating "We improved the crawl frequency and decoupled it from which index a document was stored in, and once these "supplementalization effects" were gone, the "supplemental result" tag itself—which only served to suggest that otherwise good documents were somehow suspect— was eliminated a few months ago. Now we're coming to the next major milestone in the elimination of the artificial difference between indices: rather than searching some part of our index in more depth for obscure...
Read Full Story: https://www.seroundtable.com/google-supplemental-index-dead-33656.html
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