What is Block T-SQL CRUD feature?

Applies to: Azure SQL Database Azure SQL Managed Instance

This feature allows Azure administrators to block the creation or modification of Azure SQL resources through T-SQL. This is enforced at the subscription level to block T-SQL commands from affecting SQL resources in any Azure SQL database or managed instance.


To block creation or modification of resources through T-SQL and enforce resource management through an Azure Resource Manager template (ARM template) for a given subscription, the subscription level preview features in Azure portal can be used. This is particularly useful when you are using Azure Policies to enforce organizational standards through ARM templates. Since T-SQL does not adhere to the Azure Policies, a block on T-SQL create or modify operations can be applied. The syntax blocked includes CRUD (create, update, delete) statements for databases in Azure SQL, specifically CREATE DATABASE, ALTER DATABASE, and DROP DATABASE statements.

T-SQL CRUD operations can be blocked via Azure portal, PowerShell, or Azure CLI.


In order to register or remove this feature, the Azure user must be a member of the Owner or Contributor role of the subscription.


The following section describes how you can register or unregister a preview feature with Microsoft.Sql resource provider in Azure portal:

Register Block T-SQL CRUD

  1. Go to your subscription on Azure portal.
  2. Select the Preview Features tab.
  3. Select Block T-SQL CRUD.
  4. After you select Block T-SQL CRUD, a new window will open, select Register, to register this block with Microsoft.Sql resource provider.

Select "Block T-SQL CRUD" in the list of Preview Features

With "Block T-SQL CRUD" checked, select Register

Re-register Microsoft.sql resource provider

After you register the block of T-SQL CRUD with Microsoft.Sql resource provider, you must re-register the Microsoft.Sql resource provider for the changes to take effect. To re-register the Microsoft.Sql resource provider:

  1. Go to your subscription on Azure portal.
  2. Select the Resource Providers tab.
  3. Search and select Microsoft.Sql resource provider.
  4. Select Re-register.


The re-registration step is mandatory for the T-SQL block to be applied to your subscription.

Re-register the Microsoft.Sql resource provider

Removing Block T-SQL CRUD

To remove the block on T-SQL create or modify operations from your subscription, first unregister the previously registered T-SQL block. Then, re-register the Microsoft.Sql resource provider as shown above for the removal of T-SQL block to take effect.

Next steps