Why it matters

Databases are typically the highest-risk part of any cloud deployment. Managed services reduce ops burden and encode good practices as defaults.

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The architecture

An instance runs a single database engine (Postgres, MySQL, or SQL Server). It has CPU, memory, and storage. Storage auto-grows unless disabled.

High availability configuration adds a synchronous standby in a different zone. Failover happens automatically on primary failure.

Cloud SQL HAPrimaryreads + writesHA standbysync, other zoneRead replicasasync, N replicasHA config gives auto-failover; read replicas scale read capacity
Cloud SQL topology.
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How it works end to end

Read replicas: async, in same or different region. Applications route reads to replicas for scale.

Backups: automated daily backups plus point-in-time recovery via WAL/binlog. Retention configurable.

Cloud SQL Auth Proxy provides IAM-authenticated connections without exposing the database publicly.