Monday, October 28, 2019

[google-cloud-sql-discuss] Re: Cloud SQL Zero downtime Maintenance

Short maintenance-related service interruptions do occur. You should design your applications to deal with situations when your instance is not accessible for short periods of time, such as in a maintenance shutdown. To minimize impact to your service, you can set a maintenance window to control when downtime occurs.

You can test the behavior of your application to a maintenance shutdown by restarting your instance, which has the same effect. In general, we recommend that you use only short-lived connections as well as use exponential back-off for retrying rejected connections. For more guidance see How should I manage connections?.

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