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.
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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.
That's a good general point, but Youtube does use MySQL:
https://www.mysql.com/customers/view/?id=750 http://highscalability.com/youtube-architecture