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title Altering Natively Compiled T-SQL Modules
description Learn how to perform ALTER operations on natively compiled stored procedures and natively compiled Transact-SQL modules in SQL Server and Azure SQL Database.
author MikeRayMSFT
ms.author mikeray
ms.date 03/14/2017
ms.service sql
ms.subservice in-memory-oltp
ms.topic conceptual
monikerRange =azuresqldb-current||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-current

Altering Natively Compiled T-SQL Modules

[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance]

In [!INCLUDEssNoVersion] ( [!INCLUDEsssql16-md] and later) and [!INCLUDE ssazure-sqldb], you can perform ALTER operations on natively compiled stored procedures and other natively compiled [!INCLUDEtsql] modules such as scalar UDFs and triggers using the ALTER statement.

When executing ALTER on a natively compiled [!INCLUDEtsql] module, the module is recompiled using a new definition. While recompilation is in progress, the old version of the module continues to be available for execution. Once compilation completes, module executions are drained, and the new version of the module is installed. When you alter a natively compiled [!INCLUDEtsql] module, you can modify the following options.

  • Parameters
  • EXECUTE AS
  • TRANSACTION ISOLATION LEVEL
  • LANGUAGE
  • DATEFIRST
  • DATEFORMAT
  • DELAYED_DURABILITY

Note

Natively compiled [!INCLUDEtsql] modules cannot be converted to non-natively compiled modules. Non-natively compiled T-SQL modules cannot be converted to natively compiled modules.

For more information on ALTER PROCEDURE functionality and syntax, see ALTER PROCEDURE (Transact-SQL).

You can execute sp_recompile on a natively compiled [!INCLUDEtsql] modules, which causes the module to recompile on the next execution.

Example

The following example creates a memory-optimized table (T1), and a natively compiled stored procedure (usp_1) that selects all the T1 columns. Then, usp_1 is altered to remove the EXECUTE AS clause, change the LANGUAGE, and select only one column (C1) from T1.

CREATE TABLE [dbo].[T1] (  
  [c1] [int] NOT NULL,  
  [c2] [float] NOT NULL,  
  CONSTRAINT [PK_T1] PRIMARY KEY NONCLUSTERED ([c1])  
  ) WITH ( MEMORY_OPTIMIZED = ON , DURABILITY = SCHEMA_AND_DATA )  
GO  
  
CREATE PROCEDURE [dbo].[usp_1]  
WITH NATIVE_COMPILATION, SCHEMABINDING, EXECUTE AS OWNER  
AS BEGIN ATOMIC WITH  
(  
 TRANSACTION ISOLATION LEVEL = SNAPSHOT, LANGUAGE = N'us_english'  
)  
   SELECT c1, c2 FROM dbo.T1  
END  
GO  
  
ALTER PROCEDURE [dbo].[usp_1]  
WITH NATIVE_COMPILATION, SCHEMABINDING  
AS BEGIN ATOMIC WITH  
(  
 TRANSACTION ISOLATION LEVEL = SNAPSHOT, LANGUAGE = N'Dutch'  
)  
   SELECT c1 FROM dbo.T1  
END  
GO

See Also

Natively Compiled Stored Procedures