Book: Database Playbook: Choosing the Right Store for Every System You Build

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You're picking the primary store for a multi-tenant SaaS. Three product managers want a relational schema, one wants per-tenant flexibility, and the SRE has a 47-page deck arguing both sides at once. You have a Tuesday to decide.

The argument never ends because the question is wrong. "MongoDB or Postgres" depends on the shape of the workload: write rate, schema volatility, query mix, consistency story. Pick the workload first, then the store falls out.…