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System Design Masterclass · Cloud Infrastructure
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You want a PostgreSQL database. On IaaS, here is what that means: provision a VM. Install PostgreSQL. Configure pg_hba.conf for access control. Set up postgresql.conf for performance. Configure WAL archiving for point-in-time recovery. Set up automated backups (and test them, because untested backups are not backups). Configure streaming to a standby for failover. Set up monitoring for disk space, connections, replication lag. Patch PostgreSQL quarterly for security vulnerabilities. Handle major version upgrades (which often require downtime).
That is easily 2-3 days of setup and an ongoing operational burden measured in hours per week. For a database.
With DBaaS, you click "create database," choose PostgreSQL 16, pick your instance size, and you are done. Backups happen automatically. Failover is built in. Patching happens during maintenance windows. Monitoring is included. You write . The provider manages everything else.
Amazon RDS, Neon, PlanetScale, Supabase, Google Cloud SQL, and Azure Database are all DBaaS. They have become the default choice for all but the most specialized database workloads.
The managed database market has exploded. Picking the right one depends on your data model, scale requirements, and whether you need serverless pricing.