Google Cloud SQL is Google Cloud's managed relational database service - the GCP counterpart to Amazon RDS. It runs fully-managed instances of MySQL, PostgreSQL, and SQL Server, handling the operational work (provisioning, patching, backups, replication, failover) while you connect with standard drivers and run ordinary SQL.

The three engines

Cloud SQL offers MySQL and PostgreSQL as the open-source options and SQL Server for workloads tied to the Microsoft stack. In each case it's the genuine engine, not a reimplementation, so application compatibility is high and migration is mostly a matter of moving data and repointing the connection. For PostgreSQL and MySQL workloads that need to scale further than a single instance, Google also offers AlloyDB and Cloud Spanner as higher-tier options, but Cloud SQL is the default managed choice for standard transactional databases.

What the managed service handles

Cloud SQL provides automated backups and point-in-time recovery, automatic storage increases, read replicas for scaling reads, and high availability through a regional configuration that maintains a standby in a second zone with automatic failover. It integrates with the rest of GCP - IAM for access control, Cloud Monitoring for metrics, and private connectivity through VPC so the database needn't have a public IP. The Cloud SQL Auth Proxy is the recommended connection method, handling encryption and IAM-based authentication without managing SSL certificates or allow-listing IPs by hand.

Where it fits

Cloud SQL is the right managed relational database when your application already runs on Google Cloud and uses MySQL, PostgreSQL, or SQL Server - the tight integration with GCP networking, IAM, and monitoring is the main reason to choose it over running the engine yourself. Like any managed relational service it's built for transactional (OLTP) workloads; pair it with BigQuery for analytics rather than running large aggregations against the operational database.

Frequently asked questions

Which engines does Cloud SQL support? MySQL, PostgreSQL, and SQL Server, each as the genuine managed engine.

Is Cloud SQL the same as RDS? It's the GCP equivalent - the same managed-relational concept (backups, patching, replication, failover handled for you) on Google Cloud rather than AWS.

How should applications connect? Through the Cloud SQL Auth Proxy, which handles encryption and IAM authentication without manual SSL certificates or IP allow-listing.

What about heavier scale or analytics? For scale beyond a single instance consider AlloyDB or Spanner; for analytics use BigQuery rather than querying the OLTP database directly.