"And in conclusion, we have found MySQL to be an excellent database for our website. Any questions?"
Yes, I have a question. Why didn't you use MongoDB? MongoDB is a web scale database, and doesn't use SQL or JOINs, so it's high performance.
"That's an excellent question. We evaluated several NoSQL databases and concluded that the options are still too immature for our production needs. MySQL is a proven database that is used across the web and has the features we need."
But it doesn't scale. Everybody knows that relational databases don't scale because they use JOINs and write to disk.
"Scalability is a complicated topic and it's hard to make a general statement like that."
Relational databases weren't built for web scale. MongoDB handles web scale. You turn it on and it scales right up.
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