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 Transparent Data Encryption (TDE).
The backup of the certificate that was protecting the database encryption key should be retained even if the encryption is no longer enabled on a database. Even though the database is not encrypted anymore, parts of the transaction log may still remain protected, and the certificate may be needed for some operations until the full backup of the database is performed.
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.
The following example removes the database encryption and drops the database encryption key.
ALTER DATABASE AdventureWorks2012 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 AdventureWorks2012; GO DROP DATABASE ENCRYPTION KEY; GO