close-master-key-transact-sql.md

title	CLOSE MASTER KEY (Transact-SQL)
description	CLOSE MASTER KEY (Transact-SQL)
author	VanMSFT
ms.author	vanto
ms.date	05/15/2017
ms.service	sql
ms.subservice	t-sql
ms.topic	reference
ms.custom	ignite-2025
f1_keywords	CLOSE MASTER KEY CLOSE_MASTER_KEY_TSQL
helpviewer_keywords	encryption [SQL Server], Database Master Key CLOSE MASTER KEY statement database master key [SQL Server], closing cryptography [SQL Server], Database Master Key closing Database Master Keys
dev_langs	TSQL
monikerRange	>=aps-pdw-2016 || =azuresqldb-current || =azure-sqldw-latest || >=sql-server-2016 || >=sql-server-linux-2017 || =azuresqldb-mi-current || =fabric-sqldb

CLOSE MASTER KEY (Transact-SQL)

[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics PDW FabricSQLDB]

Closes the master key of the current database.

:::image type="icon" source="../../includes/media/topic-link-icon.svg" border="false"::: Transact-SQL syntax conventions

Syntax

CLOSE MASTER KEY  

Note

[!INCLUDEsynapse-analytics-od-unsupported-syntax]

Arguments

Takes no arguments.

Remarks

This statement reverses the operation performed by OPEN MASTER KEY. CLOSE MASTER KEY only succeeds when the database master key was opened in the current session by using the OPEN MASTER KEY statement.

Permissions

No permissions are required.

Examples

USE AdventureWorks2022;  
CLOSE MASTER KEY;  
GO  

Examples: [!INCLUDEssazuresynapse-md] and [!INCLUDEssPDW]

USE master;  
OPEN MASTER KEY DECRYPTION BY PASSWORD = '43987hkhj4325tsku7';  
GO   
CLOSE MASTER KEY;  
GO  

See Also

CREATE MASTER KEY (Transact-SQL)
OPEN MASTER KEY (Transact-SQL)
Encryption Hierarchy