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Showing content from https://docs.databricks.com/aws/en/admin/sql/serverless below:

Enable serverless SQL warehouses | Databricks Documentation

This article explains how to enable serverless SQL warehouses for your workspace.

• Your Databricks account must not be on a free trial.
• Your Databricks workspace must be on the Premium plan or above.
• Your workspace control plane and serverless compute plane must be in a region that supports Databricks SQL Serverless. See Databricks clouds and regions.
• Your workspace must not use S3 access policies.
• Your workspace must not use an external Hive legacy metastore. See Remove Hive metastore credentials to enable serverless.

note

If your account was created after March 28, 2022, serverless compute is enabled by default for your workspaces.

1. Go to the feature enablement tab of the account console settings page.
2. A banner at the top of the page prompts you to accept the additional terms. Once you read the terms, click Accept. If you do not see the banner asking you to accept the terms, this step has been completed already.

After you've accepted the terms, your account is enabled for serverless.

If your workspace uses an instance profile created before June 24, 2022 for data access, you may need to update the instance profile's trust relationship to enable serverless. See Confirm or set up an AWS instance profile to use with your serverless SQL warehouses.

You do not need to complete this step if you are using Unity Catalog for data governance.

You cannot deploy serverless SQL warehouses if Hive metastore credentials are defined at the workspace level. To remove legacy Hive metastore credentials:

1. Click your username in the top bar of the workspace and select Settings from the drop-down.
2. Click the Compute tab.
3. Click Manage next to SQL warehouses.
4. In the Data Access Configuration field, locate and delete the Hive metastore credentials.
5. Click Save changes.

Like any other compute resource in Databricks, you can apply tags to serverless SQL warehouses to monitor usage and cost. You can view usage in the account console or access downloadable logs. See Usage dashboards.

Serverless warehouses have the following limitations:

• Cluster policies, including spot instance policies are unsupported. See Create and manage compute policies.
• Customer-managed VPCs are not applicable to compute resources for serverless SQL warehouses. See Configure a customer-managed VPC.
• Serverless SQL warehouses use private connectivity between the Databricks control plane and the serverless compute plane in nearly all cases. Some legacy us-east-1 region workspaces use an alternative secure network connection.
• Although the serverless compute plane does not use the secure cluster connectivity relay for the classic compute plane, serverless SQL warehouses do not have public IP addresses.
• Serverless SQL warehouses do not use customer-managed keys for EBS storage encryption. See Serverless compute and customer-managed keys.

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