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A Windows domain is a Windows network with a centralized authentication and security system. On Windows domains, users have network accounts in addition to any local accounts that they might have on individual computers. When a user signs on to a Windows domain, the user s name and password are authenticated against a central database stored on domain controllers. Domains also include network resources such as computers, shares, and printers. Regardless of which physical com puter in the domain the user is using, permissions to use network resources are granted or denied in a consistent manner.

SET TRANSACTION ISOLATION LEVEL READ COMMITTED;

Active Directory is the directory service that has provided the basic structure and fea tures of Windows domains since Windows 2000. Active Directory creates a multimas ter domain model, which means that each domain can have many domain controllers, each of which contains a read-write (master) copy of the Active Directory database. Changes made to one copy of the Active Directory database are automatically made to all other copies by means of Active Directory replication a background process that runs among all domain controllers.

To integrate SQL Server and Active Directory, you need to understand the Active Directory security model. Security structures within Active Directory include domains, organizational units, and forests. A domain is the basic structural unit within Active Directory. Active Direc tory domains are given DNS names such as fabrikam.com, and computers residing within this domain automatically assume full names such as computer1.fabrikam.com.

SELECT * FROM Test.TestTran; /* Returns the 2 rows in the table. This statement is allowed because it does not change any rows that are included in the transaction in connection 1. */ UPDATE Test.TestTran SET Col1 = 2 WHERE Col1 = 1; /* This statement is now blocked by connection 1 because it would cause the transaction in connection 1 to experience a non-repeatable read. */

Securables The securables on which specific permissions have been granted or denied to this principal. Schema

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In addition, all users in the domain automatically assume full names in the form user1@fabrikam.com (called a universal principal name [UPN]). Other objects created within domains include groups, organizational units, printers, and shares. An important security feature of domains is that they include one and only one pass word policy. If different password policies are needed for different areas of your orga nization, each of these areas must be configured as its own domain. In schematic diagrams, an Active Directory domain is represented by a triangle. Figure 3-1 presents an example of an Active Directory domain.

SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Still returns 2 rows, i.e. a non-repeatable read did not occur. */

Password Policy (through Group Policy)

This reflects the state of the WITH GRANT option for the listed permission. The With Grant check box is read-only. To apply this permission, use the GRANT (Transact-SQL) statement.

/* Abort the above query and execute the following insert statement. */ INSERT Test.TestTran (Col1, Col2) VALUES (1, 3);

Figure 3-1

Organizational Units (OUs)

SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Now returns 3 rows. The rows with the values 1 & 2 for the column Col2 are unchanged. But the row with Col2 = 3 is now included in the result. That row is a phantom read! */ COMMIT TRAN; -- Drop the table used in this example. DROP TABLE Test.TestTran;

An organizational unit (OU) is a structure typically cor responding to a department or location that contains some portion of the users,

The Effective Permissions dialog box in Object Explorer shows the result of combining explicit permissions with permissions inherited from groups and roles. The effective permissions that a principal has on a securable are the result of the explicit permissions defined for that principal on that securable, the permissions defined on the parents of the securable, and the permissions that the principal inherits through role or group membership. The Effective Permissions dialog box is read-only, and it displays the following information:

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computers, groups, and other Active Directory objects within a domain. OUs are cre ated for two reasons: to deploy specific user or computer settings in the OU by attach ing a Group Policy Object (GPO) to that OU; and to allow you to delegate control of the objects in the OU to an OU administrator. Note that OUs can contain other OUs. Every Active Directory domain includes a Domain Controllers OU, in which all domain controllers are placed by default. In schematic diagrams, an OU is represented by a circle. Figure 3-2 presents an exam ple OU structure within the domain named contoso.com.

Figure 3-2