New comment by simonw in "Ask HN: Has anybody shipped a web app at scale with 1 DB per account?"

This is pretty much how WordPress.com works - or used to work, I don't know if they changed this.

Each account gets its own set of database tables (with a per-account table prefix) which are located in the same database. Upgrades can then take place on an account-by-account basis. They run many, many separate MySQL databases.

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