Quotas and limits

This page provides information about the Cloud SQL quotas and limits. Quotas are applied per-project; limits are applied to the instance or to the project, depending on the limit.

Checking your quotas

To check the current quotas for resources in your project, go to the Quotas page in the Google Cloud Console.

Increasing your quotas

As your use of Google Cloud expands over time, your quotas can increase accordingly. If you expect a notable upcoming increase in usage, make your request a few days in advance to ensure your quotas are adequately sized.

  1. In the Quotas page, select Cloud SQL Admin API in the Services dropdown list.

    If you do not see Cloud SQL Admin API, the Cloud SQL Admin API has not been enabled.

  2. Select the quotas you want to change.

  3. Click Edit quotas.

  4. Fill out your name, email, and phone number and click Next.

  5. Fill in your quota request and click Submit request.

You will receive a response from the Cloud SQL for MySQL team within 48 hours of your request.

How resource quotas are replenished

Daily quotas are replenished daily at midnight Pacific time.

Quotas and resource availability

Resource quotas are the maximum amount of resources you can create for that resource type if those resources are available. Quotas do not guarantee that resources will be available at all times. If a resource is not physically available for your region, you will not be able to create new resources of that type, even if you still have remaining quota in your project.


There are restrictions on some Cloud SQL resources that are not replenished periodically and not shown on the Quotas page in the Google Cloud Console. Some limits can be increased while others cannot.

Configurable limits

Instances per project

By default, you can have up to 40 instances per project. If you need more, file a support case to request the increase.

Maximum concurrent connections

You can use the max_connections flag to configure connections limits. The Cloud SQL team recommends using the default connection limits to ensure instance stability. You can find the connection limits for your instance by connecting to your database and running this command: SHOW VARIABLES LIKE "max_connections";

Cloud SQL for MySQL default connection limits

Machine type Default concurrent connections
db-f1-micro 250
db-g1-small 1,000
All other machine types 4,000

Fixed limits

Cloud SQL storage limits

MySQL instances PostgreSQL and SQL Server instances
Up to 30,720 GB, depending on the machine type. Up to 30,720 GB, depending on whether the instance has dedicated or shared vCPUs. See the Instance settings for PostgreSQL or SQL Server.

Cloud SQL storage options

To configure a storage option for best performance, it's important to understand your workload and choose the appropriate disk type and size. For more information on the available choices for Cloud SQL, see instance settings.

App Engine Limits

Each App Engine instance running in a standard environment cannot have more than 100 concurrent connections to an instance. For PHP 5.5 apps, the limit is 60 concurrent connections.

App Engine applications are subject to request time limits depending on usage and environment. For more information, see how instances are managed in App Engine standard and flexible environments.

App Engine applications are also subject to additional App Engine quotas and limits as discussed on the App Engine Quotas page.