What caused indexed pages to disappear: A SEO checklist for problems with indexed pages

What caused indexed pages to disappear: A SEO checklist for problems with
indexed pages

A indexed page can disappear temporarily if they are very newly indexed and that they are not added to the main database of search engines. For search engines like Google they maintain many clusters of computers to store data and sometimes the data that is freshly collected from their crawler is not directly added to the main database but to a small cluster. So when this data propagates to other clusters the pages might become temporarily unavailable for a certain period of time but will eventually come back after a few days when the propagation is done with the Search Engine.

A page can disappear if Google finds something wrong with that page we discussed about this on page specific Google penalty here.
A page can disappear when suddenly it attracts 1000s of backlinks. This might suddenly trigger a filter with Search engine algorithms and that page might go through a strong search engine spam filter and once it clears it will be available again.
If a page has any server related problems and not accessible by search engines it will disappear from search engine index
If a page has problems with the html or dynamic code and again not properly rendering for the search engines it will be booted temporarily from the index.
If a page has hidden links and if detected by spam detecting Googlebot it will assigned a temporary penalty and will be booted from the index.
Manual review by certain search engines have made pages disappear. This is though very rare but it does happen and search engines do this to make sure users are not led to the wrong page.

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What caused indexed pages to disappear: A SEO checklist for problems with indexed pages

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