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by dangrossman 4583 days ago
Yes, this information is incorrect. MySQL does not "run in memory" moreso than other RDBMS's; it has various in-memory caches but persists your data to disk. SQL is not a database, but the language you use to talk to one. NoSQL is not a specific file-backed database but a category of software, some of which persist data to disk and some of which don't.