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Near-zero downtime upgrades: Announcing Cloud SQL for MySQL blue-green deployments Vinod Kumar Subramanian Senior Product Manager, Cloud SQL Itay Maoz Senior Engineering Director, Cloud SQL Keeping production databases on supported versions shouldn’t require giving up your weekend. To stay secure, compliant, and with the best performance and newest AI capabilities, organizations need to run on the latest database engine versions. Yet for many teams, major version upgrades mean weeks of cross-team coordination, negotiating narrow maintenance windows, and hours of application downtime. In an era where mission-critical applications and AI agents operate as 24/7 systems of action, even a brief maintenance outage can mean disrupted customer experiences and lost revenue. To help, we are excited to announce the preview of fully managed blue-green deployments in Cloud SQL, starting with Cloud SQL for MySQL. You can now execute major version upgrades and configuration updates with minimal downtime via the Google Cloud console or automated CLI scripts. By continuously synchronizing a parallel environment, teams can safely test with production data before a seamless cutover — all while keeping the original database as a reliable safety net after the switchover. Why the upgrade dilemma matters to your business Putting off major version upgrades (like moving from MySQL 8.0 to 8.4) exposes you to security vulnerabilities and causes you to miss out on performance improvements and latest AI capabilities. To test changes and avoid in-place upgrade downtime, teams often turn to a blue-green deployment — testing changes on a separate, upgraded staging copy (green) alongside the live database (blue) and switching traffic over once it’s ready. However, manual blue-green setups are incredibly complex to build, synchronize, and safely cut over. Cloud SQL’s fully managed blue-green deployments can turn your database upgrades from a high-risk weekend project into a predictable, low-downtime operation. The technical differentiators With Cloud SQL, managed blue-green deployments automate the entire lifecycle across three stages: - Blue environment (production): Your current primary Cloud SQL instance, which continues serving live application traffic without interruption. - Green environment (staging): A temporary clone of your blue instance that Cloud SQL upgrades to your target database version and keeps in sync via continuous replication. - Switchover: When you're ready to cut over, Cloud SQL briefly sets the blue instance to read-only, finishes the final data synchronization, and promotes the green instance to your new primary database. Three notable capabilities make this release a game-changer for enterprise workloads: - Near-zero downtime cutover: The transition from the old version to the new version is incredibly fast. Organizations using Cloud SQL Enterprise Plus experience sub-second downtime for maintenance. - No application changes: When you trigger the switchover, Cloud SQL automatically transfers your existing database IP address, instance name, and backups to the new database. Your developers do not need to rewrite connection strings, modify configuration files, or update client applications. - Safe, real-data testing: You can run real application traffic and queries against the upgraded green environment to verify performance before going live. If you spot an issue, simply delete the deployment before switchover without touching your live database. Simple to orchestrate, built to scale Upgrading your database environment can now be initiated in just a few clicks within the console, or via a simple CLI script. With near-zero downtime switchovers, this feature takes the risk out of database upgrades. By shifting maintenance from a weekend chore to a routine daytime task, your team can stay ahead of security lifecycles, unlock the latest AI-ready engine features, and focus on building features that drive business growth, not managing infrastructure risk. Try it today Near-zero downtime database upgrades are available in preview for Cloud SQL for MySQL standalone primary instances, including High Availability configurations, with support for PostgreSQL coming soon. Get started today by visiting the Cloud SQL console or reviewing the step-by-step documentation.
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