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You must configure each SQL Server clustered instance with a dedicated set of drive letters. On a stand-alone server, multiple instances can store databases on the same drive or even in the same directory as other instances. In a cluster, the drives are mounted to a particular node at any given time. Any other node does not have access to those drives. You can configure an instance of SQL Server to run on any node. If you could configure more than one SQL Server clustered instance to store databases on the same drive letter, it would be possible to create a configuration in which the instance is running on one node while another node has ownership of the disks, thereby rendering the SQL Server instance inoperable. The concept of disk configurations in a SQL Server cluster is known as the instanceto-disk ratio. Although a SQL Server cluster instance can address more than one drive letter, a drive letter can be associated to only a single SQL Server cluster instance. Additionally, a drive letter must be configured as a dependency of the SQL Server ser vice being allowed to store databases.

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You need to configure each SQL Server service with a service account. You should gen erally use a different account for each SQL Server service such as SQL Server, SQL Server Agent, and Full Text. Although the accounts do not need any special privileges, they must be domain accounts because the Security Identifier (SID) for a local account cannot be resolved on another machine.

In the following practice session, you obtain an estimated execution plan for a query against a table in the AdventureWorks database. The practice uses the SSMS graphical execution plan. You can extend the practice by using other methods described in this lesson to capture query plan statistics.

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9. Ensure that the command completes successfully and returns no errors. When complete, there should be a file named TK4428Lab1.dll in the C:\TK442 \8\Code\Lab1 directory. 10. Return to Microsoft SQL Server Management Studio, and execute the following command from the new query window for the AdventureWorks database:

SQL Server 2005 changes the way Windows permissions are handled for service accounts In previous versions of SQL Server, permissions were granted directly to the SQL Server related service accounts Because the service accounts needed to have administrative authority on the machines, it did not pose a significant issue SQL Server 2005 does not require service accounts with administrative authority in Windows This has created a situation in which a Windows account could have doz ens of individual permissions granted to it, such as registry access, directory access, and file access permissions Changing service accounts would become very compli cated because you would have to assign all these individual permissions to the new service account to ensure that services continue to function normally With the shift in the security infrastructure, the Windows accounts for SQL Server 2005 services are designed to follow industry-accepted practices for managing Win dows accounts.

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

Windows groups are granted permissions on the various resources that will be accessed Windows accounts are then added to their respective groups to gain access to resources On a stand-alone machine, these groups are created by default of the form SQLServer2005MSSQLUser$<machine name>$<instance name>, SQLServer2005 SQLAgentUser$<machine name>$<instance name>, and SQLServer2005MSFE User$<machine name>$<instance name> SQL Server Setup automatically assigns permissions on the directories, registry keys, and other resources needed to allow a SQL Server to function to the appropriate group It then adds the service account to the respective group Although this process works on a stand-alone machine, it is not as simple in a cluster Within the cluster, a SQL Server failover cluster instance can be running on any phys ical machine in the cluster Local Windows groups do not have a valid security con text across machines.

1. Log in to your domain at your member server by using either your domain administrator account or an account that has been added to the sysadmin server role. If you are using virtual machine software, log in to your domain and connect to your member server. 2. From Programs, Microsoft SQL Server 2005, click SQL Server Management Studio. Connect to the database engine on your member server, specifying Windows Authentication. Specify TCP/IP and the AdventureWorks database. Click Connect. 3. Click New Query to start Query Editor. 4. In the Query pane, type the following query:

Therefore, the groups for the SQL Server service accounts need to be created at domain level The installation routine does not assume that you have the authority to create groups in the domain You need to create these domain groups prior to installing a SQL Server failover cluster instance You have to define three groups within the domain that have the following purposes:.

CREATE FUNCTION GetProductID(@prodNumber nvarchar(25)) RETURNS int EXTERNAL NAME TK4428Lab1.TK4428.GetProductID