Auto grow storage in Azure Database for MySQL using the Azure portal
APPLIES TO: 
Azure Database for MySQL - Single Server
Important
Azure Database for MySQL single server is on the retirement path. We strongly recommend that you upgrade to Azure Database for MySQL flexible server. For more information about migrating to Azure Database for MySQL flexible server, see What's happening to Azure Database for MySQL Single Server?
This article describes how you can configure an Azure Database for MySQL server storage to grow without impacting the workload.
When a server reaches the allocated storage limit, the server is marked as read-only. However, if you enable storage auto grow, the server storage increases to accommodate the growing data. For servers with less than 100 GB provisioned storage, the provisioned storage size is increased by 5 GB as soon as the free storage is below the greater of 1 GB or 10% of the provisioned storage. For servers with more than 100 GB of provisioned storage, the provisioned storage size is increased by 5% when the free storage space is below 10GB of the provisioned storage size. Maximum storage limits as specified here apply.
Prerequisites
To complete this how-to guide, you need:
Enable storage auto grow
Follow these steps to set MySQL server storage auto grow:
In the Azure portal, select your existing Azure Database for MySQL server.
On the MySQL server page, under Settings heading, click Pricing tier to open the Pricing tier page.
In the Auto-growth section, select Yes to enable storage auto grow.
Click OK to save the changes.
A notification will confirm that auto grow was successfully enabled.
Next steps
Learn about how to create alerts on metrics.