Chapter 3 PHYSICAL DATABASE DESIGN AND IMPLEMENTATION 145
Chapter 3 PHYSICAL DATABASE DESIGN AND IMPLEMENTATION 145 procedures, which enable DLL files to be accessed from the operating system, are pre-established and present in the Master database. The T-SQL CREATE PROCEDURE statement is used to create a stored procedure. This statement can be executed from the Query Analyzer or it is available through the Enterprise Manager by right-clicking on Stored Procedures under the database and choosing the New Stored Procedure option. The procedure is then saved within the current database as an object. Encryption Can Secure Definitions Data encryption is a mechanism that can be used to secure data, communications, procedures, and other sensitive information. When encryption techniques are applied, sensitive information is transformed into a non-readable form that must be decrypted to be viewed. Encryption slows performance, regardless of the method implemented, because extra processing cycles are required whenever encryption or decryption occurs. SQL Server can use data encryption at several levels: Login information Application role passwords Stored procedures Views User-defined functions Triggers Defaults Rules Data sent over the network A variety of encryption procedures can be performed by a developer or administrator depending on what level of encryption is desired. SQL Server always encrypts login and role passwords within the system tables stored on the server. This automatic encryption of the login information stored on the server can be overridden using sp_addlogin, but this is not recommended. By default, however, application role passwords are not encrypted if they are provided
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