MSSQL Database 암호화 키 삭제

-- 데이터 베이스 암호화 제거
ALTER DATABASE AdventureWorks2012  
SET ENCRYPTION OFF;  

-- 암호화 키 삭제
DROP DATABASE ENCRYPTION KEY  

-- 데이터베이스 암호화 확인
SELECT db_name(database_id), encryption_state  
FROM sys.dm_database_encryption_keys;  


---------------------------
---------------------------

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  

---------------------
ALTER DATABASE AdventureWorksPDW2012  
    SET ENCRYPTION OFF;  
GO  
/* Wait for decryption operation to complete, look for a   
value of  1 in the query below. */  
WITH dek_encryption_state AS   
(  
    SELECT ISNULL(db_map.database_id, dek.database_id) AS database_id, encryption_state  
    FROM sys.dm_pdw_nodes_database_encryption_keys AS dek  
        INNER JOIN sys.pdw_nodes_pdw_physical_databases AS node_db_map  
           ON dek.database_id = node_db_map.database_id AND dek.pdw_node_id = node_db_map.pdw_node_id  
        LEFT JOIN sys.pdw_database_mappings AS db_map  
            ON node_db_map .physical_name = db_map.physical_name  
        INNER JOIN sys.dm_pdw_nodes AS nodes  
            ON nodes.pdw_node_id = dek.pdw_node_id  
    WHERE dek.encryptor_thumbprint <> 0x  
)  
SELECT TOP 1 encryption_state  
       FROM  dek_encryption_state  
       WHERE dek_encryption_state.database_id = DB_ID('AdventureWorksPDW2012 ')  
       ORDER BY (CASE encryption_state WHEN 3 THEN -1 ELSE encryption_state END) DESC;   
GO  
USE AdventureWorksPDW2012;  
GO  
DROP DATABASE ENCRYPTION KEY;  
GO  

참고 자료

https://docs.microsoft.com/ko-kr/sql/t-sql/statements/drop-database-encryption-key-transact-sql?view=sql-server-ver15 

DROP DATABASE ENCRYPTION KEY(Transact-SQL) - SQL Server