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Security best practices would create a domain-level group for each type of service and for each SQL Server cluster installed. Management simplicity would create a domain-level group for each of the three services, and all SQL Server failover cluster instances would specify the same set of domain groups. You need to determine where to balance a very secure (but highly complex) domain group scheme with a less complex (but less secure) domain group scheme.

12. Ensure that the query executed successfully. Replace the code in step 10 with the following code:

Clustering performs two health checks against a SQL Server failover cluster instance. The first check performed is the LooksAlive test, which is a ping from each node in the cluster to the IP address of the SQL Server instance. However, a ping test does not indicate that an instance is available the instance could be responding to a ping, but still be inaccessible. To detect availability issues because of SQL Server being unavailable, a second check, the IsAlive test, is performed. The IsAlive test creates a connection to the SQL Server instance and issues SELECT @@SERVERNAME. The SQL Server must return a valid result set to pass this health check.

USE AdventureWorks GO SELECT * FROM HumanResources.Employee WHERE SUBSTRING(NationalIDNumber,1,1) = '8' UNION SELECT * FROM HumanResources.Employee WHERE Title LIKE 'P%'GO

If either health check fails, the cluster initiates a failover of the SQL Server instance. The first step in the failover process is to restart SQL Server on the same node. The instance is restarted on the same node because the cluster first assumes that a tran sient error caused the health check to fail. If the restart does not respond immediately, the SQL Server group fails over to another node in the cluster (secondary node). The network name of the SQL Server is unregistered from DNS. The SQL Server IP address is bound to the network inter face card (NIC) on the secondary node. The disks associated to the SQL Server instance are mounted on the secondary node. After the IP address is bound to the NIC on the secondary node, the network name of the SQL Server instance is regis tered into DNS. After the network name and disks are online, the SQL Server service is started. After the SQL Server service is started, SQL Server Agent and Full Text indexing are started.

Select dbo.GetProductID('AR-5381')

8

Regardless of whether the instance was restarted on the same node or on a secondary node, the SQL Server instance is shut down and restarted. Any transactions that have not completed when the failover process is initiated are rolled back when SQL Server restarts. Upon restarting, the normal process of restart recovery is followed. In general, a cluster will fail over in 10 15 seconds. The failover time can be affected by the registration into DNS and it can also be increased if a large number of databases are configured on the instance. In SQL Server 2000, the failover time was bound by the amount of time it took for both the redo and undo phases to complete, which left the failover time at the mercy of the applications issuing transactions against data bases. Because databases are now available as soon as the redo phase completes, a SQL Server 2005 clustered instance fails over and has databases available much more rapidly.

1. Name and explain the two basic kinds of partitioning. 2. What is the purpose of a partition scheme 3. What two methods can be used to specify the name of a linked server in a query 4. What is the purpose of a Distributed Partition View (DPV) 5. Which scale-out technique uses middleware to route requests to the appropriate database server 6. Which SQL Server 2005 features can applications built with the Service-Oriented Database Architecture (SODA) take advantage of 7. Which scale-out technique is best for transparently distributing data across multiple servers 8. What does SQLCLR provide

5. Click Display Estimated Execution Plan. The estimated execution plan output is shown in Figure 2-8. Right-click anywhere in the Execution Plan pane and choose Save Execution Plan As to save the estimated execution plan.