Afterward, you must explicitly open the Database Master Key with a password. You can exclude the Database Master Key of a specific database from automatic key management by using the ALTER MASTER KEY statement with the DROP ENCRYPTION BY SERVICE MASTER KEY option. Regenerating the DMK key to upgrade to AES is only necessary once, and has no impact on future regenerations as part of a key rotation strategy. The time required to regenerate the DMK key to upgrade to AES depends upon the number of objects protected by the DMK. For more information about regenerating the DMK, see ALTER MASTER KEY (Transact-SQL). When a database has been upgraded from an earlier version, the DMK should be regenerated to use the newer AES algorithm. Once the DMK has been decrypted, you have the option of enabling automatic decryption in the future by using the ALTER MASTER KEY REGENERATE statement to provision the server with a copy of the DMK, encrypted with the service master key (SMK). You must use the OPEN MASTER KEY statement to decrypt the database master key (DMK). When a database is first attached or restored to a new instance of SQL Server, a copy of the database master key (encrypted by the service master key) is not yet stored in the server. In this case, it is not necessary to use the OPEN MASTER KEY statement. If the database master key was encrypted with the service master key, it will be automatically opened when it is needed for decryption or encryption. The password with which the Database Master Key was encrypted. To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation.
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