Neither Amazon nor Google run off of an RDBMS. Relational databases are awesome,... | Hacker News

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		stickfigure on March 24, 2018 \| parent \| context \| favorite \| on: Managing database schema changes without downtime Neither Amazon nor Google run off of an RDBMS. Relational databases are awesome, but it's much harder to achieve 100% uptime compared to schemaless, distributed, replicated data stores. You easily can take down your system with one innocuous-looking DDL migration that works great in test but grinds the machine to a halt on a production dataset.

theptip on March 26, 2018 [–]

That's a good general point, but Youtube does use MySQL:

https://www.mysql.com/customers/view/?id=750 http://highscalability.com/youtube-architecture

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