Dela via

  • Artikel

DROP DATABASE ENCRYPTION KEY (Transact-SQL)

Drops a database encryption key that is used in transparent database encryption. For more information about transparent database encryption, see Understanding Transparent Data Encryption (TDE).

Topic link iconTransact-SQL Syntax Conventions

Syntax

DROP DATABASE ENCRYPTION KEY

Remarks

If the database is encrypted, you must first remove encryption from the database by using the ALTER DATABASE statement. Wait for decryption to complete before removing the database encryption key. For more information about the ALTER DATABASE statement, see ALTER DATABASE SET Options (Transact-SQL). To view the state of the database, use the sys.dm_database_encryption_keys dynamic management view.

Permissions

Requires CONTROL permission on the database.

Examples

The following example removes the database encryption and drops the database encryption key.

ALTER DATABASE AdventureWorks2008R2;
SET ENCRYPTION OFF;
GO
/* Wait for decryption operation to complete, look for a 
value of  1 in the query below. */
SELECT encryption_state
FROM sys.dm_database_encryption_keys;
GO
USE AdventureWorks2008R2;
GO
DROP DATABASE ENCRYPTION KEY;
GO