TAILIEUCHUNG - Microsoft SQL Server 2008 R2 Unleashed- P35

Microsoft SQL Server 2008 R2 Unleashed- P35:SQL Server 2005 provided a number of significant new features and enhancements over what was available in SQL Server 2000. This is not too surprising considering there was a five-year gap between these major SQL Server 2008 is not as much of a quantum leap forward from SQL Server 2005 | 294 CHAPTER 11 Security and User Administration Some complexity has been introduced based on the hierarchical nature of some of the security components. Security can be established on these hierarchical components which in turn cascades the security to the underlying components. In addition not all the permission components apply to every securable. Many of the securables have a select number of permissions that apply to them conversely many permissions apply only to a select number of securables. For example SELECT permission is applicable to securables such as tables and views but would not be appropriate for stored procedures. The following sections discuss the tiers of the security model and their underlying components. Authentication Methods The first level of security encountered when accessing SQL Server is known as authentication. The authentication process performs the validation needed to allow a user or client machine to connect to SQL Server. This connection can be granted via a Windows login or SQL Server login. Windows Authentication Mode Windows Authentication mode validates the account name and password using information stored in the Windows operating system. A Windows account or group must be established first and then security can be established for that account in SQL Server. This mode has the advantage of providing a single login account and the capability to leverage domain security features such as password length and expiration account locking encryption and auditing. Microsoft recommends this approach. Mixed Authentication Mode Mixed authentication allows for both Windows authentication and SQL Server authentication. SQL Server authentication is based on a login that is created in SQL Server and lives in SQL Server only. No Windows account is involved with SQL Server authentication. The account and password are established and maintained in SQL Server. SQL Server logins can be created with stronger password enforcement that help better .

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