Index
The search engine‘s database where all indexed pages are stored. Being in the index is a necessary condition for ranking.
On this page
What is the indexHow to check if a page is indexedWhy a page may be missing from the indexIn brief
The index is a structured repository of information about web pages that the search engine uses to generate search results. If a page is not in the index, it cannot appear in search results for any query.
What is the search engine index
The index is a huge database where the search engine stores information about web pages: text, headings, meta tags, links, structured data, and more. When a user enters a query, the algorithm looks for the most relevant pages in the index. Without indexing, a page is invisible to search.
How to check if a page is indexed
- Use the `site:domain.com` operator in Google (approximate count).
- Google Search Console → 'Coverage' report (exact data).
- The 'URL Inspection' tool in GSC (status of a specific page).
Why a page may be missing from the index
- The page has a `noindex` tag or `X-Robots-Tag: noindex`.
- The page is blocked in robots.txt (not recommended for blocking indexing).
- The page is a duplicate with a canonical pointing to another URL.
- The site is under a manual action or penalty.
- The page returns a 404 or 5xx error.
- The bot could not discover it (poor internal linking, no external links).
Indexing is necessary but not sufficient for high rankings. Even an indexed page may not rank if it is irrelevant to queries or has low quality.
FAQ
Common questions
The index contains all pages the search engine knows about. SERP (Search Engine Results Page) is a page of results for a specific query, showing only a tiny portion of the index.
Constantly. Popular pages may be re‑indexed several times a day, less popular ones every few weeks. You can request expedited indexing via GSC.
Yes, if it becomes unavailable (404), the owner adds noindex, or Google decides the page is outdated / low quality.
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