- When applications require maximum SQL Server feature surface area
- If an application depends on SQL Server features that Cloud SQL explicitly does not support, alternatives to consider include:
- SQL Server on Compute Engine (self-managed), or
- Azure SQL Managed Instance or SQL Server on Azure VM, depending on compatibility needs.
- When cost sensitivity dominates (especially for small workloads)
- For development, hobby, or low-traffic workloads, community reports indicate Cloud SQL can be more costly than self-managed VMs or simpler alternatives.
- When specific HA topologies are required
- If active-active read endpoints, custom failover orchestration, or specialized clustering patterns are needed but not offered by Cloud SQL’s HA implementation, other deployment models may be more appropriate.
- When an organization is deeply standardized on Azure
- Migration friction and tooling alignment may favor Azure SQL Managed Instance for Azure-centric estates.
- Feature limitations versus full SQL Server
- Google publishes a Cloud SQL for SQL Server features page that lists SQL Server engine features unavailable in Cloud SQL.
- Practical implication: buyers should run a compatibility assessment against current SQL Server usage (agent jobs, linked servers, CLR usage, etc.) and map dependencies to Cloud SQL support.
- Maintenance and upgrades
- Google documents maintenance behavior for Cloud SQL for SQL Server.
- Enterprise Plus editions have different planned maintenance handling compared with other editions; differences in planned maintenance behavior should be reviewed when selecting an edition.
- Version support
- Cloud SQL documentation lists supported SQL Server versions and editions. Confirm supported versions for new and legacy workloads before migrating.
- Cost predictability
- Community feedback frequently cites higher-than-expected bills when calculator assumptions differ from actual configuration (licensing, networking, storage, and HA factors).