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When indexing goes wrong: how Google Search recovered from indexing issues & lessons learned since.

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Most of the time, our search engine runs properly. Our teams work hard to prevent technical issues that could affect our users who are searching the web, or webmasters whose sites we index and serve to users. Similarly, the underlying systems that we use to power the search engine also run as intended most of the time. When small disruptions happen, they are largely not visible to anyone except our teams who ensure that our products are up and running. However, like all complex systems, sometimes larger outages can occur, which may lead to disruptions for both users and website creators.

In the last few months, such a situation occurred with our indexing systems, which had a ripple effect on some other parts of our infrastructure. While we worked as quickly as possible to remedy the situation, we apologize for the disruption, as our goal is to continuously provide high-quality products to our users and to the web ecosystem.

Since then, we took a closer, careful look into the situation. In the process, we learned a few lessons that we'd like to share with you today. In this blog post, we will go into more details about what happened, clarify how we plan to communicate better if such things happen in the future, and remind website owners of the channels they can use to communicate with us.

So, what happened a few months ago?

In April, we had several issues related to our index. The Search index is the database that holds the hundreds of billions of web pages that we crawled on the web and that we think could answer some of our users’ queries. When a user enters a query in the Google search engine, our ranking algorithms

Read more from our friends at Google Webmaster Central

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