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The serializable isolation level guarantees that none of the concurrency problems mentioned earlier can occur. Because this isolation level also protects from the occurrence of phantom reads through blocking, the use of the serializable isolation level increases the risk for blocked transactions and deadlocks even more than using the repeatable read isolation level. This isolation level guarantees that if you issue two DML statements against the same table with the same WHERE clause, both queries will return exactly the same results, including the same number of rows. To protect the transaction from inserts, SQL Server will need to lock a range of an index over a column that is included in the WHERE clause with shared locks. If such an index does not exist, SQL Server will need to lock the entire table. The following example shows the behavior of the serializable isolation level:

Multiple Active Directory domains can be integrated into a single intercon nected security entity called a forest. All domains in an Active Directory forest trust each other; therefore, a user whose account is created in any one domain such as con toso.com can log on to any other domain in the same forest. Every domain must belong to a forest. If your network includes only one domain, the forest is the same as the domain. Figure 3-3 provides a schematic illustration of an Active Directory forest.

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ALTER DATABASE <current_database> SET ALLOW_SNAPSHOT_ISOLATION OFF; ALTER DATABASE <current_database> SET READ_COMMITTED_SNAPSHOT OFF; -- Table including some example rows used in this example. CREATE TABLE Test.TestTran (Col1 INT NOT NULL, Col2 INT NOT NULL); INSERT Test.TestTran (Col1, Col2) VALUES (1, 1); INSERT Test.TestTran (Col1, Col2) VALUES (1, 2);

Figure 3-3

SET TRANSACTION ISOLATION LEVEL SERIALIZABLE; BEGIN TRAN; SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Returns 2 rows. */

The native authentication protocol used in Active Directory domains is Kerberos. Ker beros is considered highly secure, but it is supported only on clients running Windows 2000 or later. (For backward compatibility with earlier clients, such as those running Windows NT or Windows 98, Active Directory domains also support the NTLM authentication protocol, which was native in Windows NT domains.) If you want your authentication solution for SQL Server to use the Kerberos protocol, you must config ure SQL Server to use Windows authentication mode. However, some clients cannot connect to Windows domains either through Kerberos or NTLM. For example, an application might need to establish communication between a handheld device and a SQL Server computer. If the handheld device cannot allow a user to authenticate to the Active Directory domain, you must configure your SQL Server computer to use mixed authentication mode (SQL Server and Windows authentication mode).

To complete the lessons in this chapter, you must have completed the following tasks:

For the 70-443 exam, you need to understand that if you require Kerberos authentica tion, you must deploy SQL Server in an Active Directory domain.

SET TRANSACTION ISOLATION LEVEL READ COMMITTED;

A service principal name (SPN) is the name by which a client uniquely identifies an instance of a service. When a client wants to connect to a service in a Kerberos net work, it locates an instance of the service, composes an SPN for that instance, con nects to the service, and presents the SPN for the service to authenticate. To use Kerberos mutual authentication, you must ensure that the SQL Server 2005 instances have an SPN configured in Active Directory. When you configure SQL Server to run under the local system account, this SPN is automatically created. How ever, if you configure SQL Server to run under a service account, you should create the SPN manually. To configure an SPN for SQL Server, use the SETSPN utility available on the Windows Server 2003 CD. When configuring a domain account for use as a service account with SQL Server, be sure to enable the Account Is Trusted For Delegation option in the properties of the user account.

You need to understand these points about SPNs and SQL Server service accounts for the 70-443 exam.