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This article details Cloudflare's successful migration of billions of DNS records from their main database cluster to a new dedicated DNS database. The migration involved moving 1.7 billion records from the primary DNS table and 4.3 billion records from an archive table, while ensuring zero data loss and minimal downtime

https://blog.cloudflare.com/migrating-billions-of-records-moving-our-active-dns-database-while-in-use/
Cloudflare Blog Migrating billions of records: moving our active DNS database while it’s in use According to a survey done by W3Techs, as of October 2024, Cloudflare is used as an authoritative DNS provider by 14.5% of all websites
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