CLOSE SYMMETRIC KEY (Transact-SQL)
Applies To: SQL Server 2014, SQL Server 2016 Preview
Closes a symmetric key, or closes all symmetric keys open in the current session.
Is the name of the symmetric key to be closed.
Open symmetric keys are bound to the session not to the security context. An open key will continue to be available until it is either explicitly closed or the session is terminated. CLOSE ALL SYMMETRIC KEYS will close any database master key that was opened in the current session by using the OPEN MASTER KEY statement. Information about open keys is visible in the sys.openkeys (Transact-SQL) catalog view.
No explicit permission is required to close a symmetric key.
The following example closes the symmetric key ShippingSymKey04.
CLOSE SYMMETRIC KEY ShippingSymKey04; GO