Platform · 2009–now · Cloud Scale
MongoDB
Document DB that became a punchline, then a grown-up product. Survived by getting serious about transactions and ops.
How MongoDB mutated
MongoDB mutated from "web scale" meme into a real database with transactions and adult ops stories. Early defaults punished newcomers; the company listened because ridicule is expensive. It stuck where flexible documents beat rigid schemas — not everywhere.
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Practice · 2009–2019
NoSQL for Everything
Schema-optional databases sold as a lifestyle. Right tool for some jobs; default for none.
$ Startups ditched Postgres for document stores "because scale," then rebuilt relational integrity in application code — and paid twice when joins came back as a product requirement.
Platform · 1974–now
SQL / Relational
Declarative data that outlived every ORM fashion cycle. Postgres and friends keep winning by being boring.