close-master-key-transact-sql.md

title	CLOSE MASTER KEY (Transact-SQL) | Microsoft Docs
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ms.date	03/06/2017
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f1_keywords	CLOSE MASTER KEY CLOSE_MASTER_KEY_TSQL
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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
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CLOSE MASTER KEY (Transact-SQL)

[!INCLUDEtsql-appliesto-ss2008-all_md]

Closes the master key of the current database.

Transact-SQL Syntax Conventions

Syntax

-- Syntax for SQL Server, Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse  
  
CLOSE MASTER KEY  

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 AdventureWorks2012;  
CLOSE MASTER KEY;  
GO  

Examples: [!INCLUDEssSDWfull] 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