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USE AdventureWorks; GO SET STATISTICS IO ON; GO SELECT * FROM Production.ProductCostHistory WHERE StandardCost < 500.00; GO SET STATISTICS IO OFF; GO

8

the results back to the client. SendResultsStart Used to send data that did not originate from a SqlDataReader object back to a client. Accepts a SqlDataRecord object as input and marks the beginning of the result set.

You can separate cluster resources, which are the most granular items that you can configure within a cluster, into the broad categories shown in Table 8-4.

Table 8-4

Used in conjunction with SendResultsStart and SendResultsRow to send data back to the client. This method is used to set SqlPipe back to its original state.

This example returns the following result set, which you can view on the Messages tab:

Resources that are physically attached to a machine cannot be configured in a cluster, so you might wonder how disk drives can be defined as a cluster resource As described in the Disk Configuration section, all data within a cluster must reside on an external drive array The external drive array can be a Fibre channel cabinet attached to each node in the cluster or a SAN that is connected to all nodes in the clus ter You cannot configure the local hard drive in each node as a cluster resource The physical disk drives within the disk array are not the actual cluster resources The disk mount definition within Windows is configured and controlled by Windows clustering Although a disk resource is defined on all nodes, only the node that is con figured to own the disk resource has the disks mounted and accessible.

SQL Server provides command-line compilers that can be used to generate an assembly from a code file. If you are using Visual Basic, you will use vbc.exe, and if you are using C#, you will use csc.exe. To use the compiler, go to a Visual Studio 2005 Command Prompt and enter a command such as the following example. Replace <dir> with the location that you ve created for testing this example. You also have the option of creating a directory named c:\TK442\8\Code\Lab1, which will be used in a lab exercise later in the chapter.

All other nodes maintain the disk mount definition but have the disks unmounted, which pre vents more than one machine from writing to the same media at the same time The main resource that is configured in a cluster is a service such as SQL Server or SQL Server Agent Although each node in the cluster has an entry for a given service, it is started only on a single node within the cluster One of the most powerful elements within a cluster is the way in which IP addresses and network names are handled Although each node in the cluster carries the IP address and network name definition, only the node designated as the owner of the IP address and name has it bound to a physical network card When a failover occurs to another node, clustering performs the following operations on the network stack: 1.

Unregisters the network name from DNS 2 Binds the IP address to a physical network card on the operational node 3 Reregisters the network name in DNS..

By executing the compiler, you will generate a dynamic-link library (DLL) file that is placed in the target library by default, <dir>\. You will then need to create an assembly in SQL Server that lets you access the stored procedure. You do so by executing a Transact-SQL statement, such as the following, from a new query window:

Table 'ProductCostHistory'. Scan count 1, logical reads 5, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

This process ensures that all applications maintain the same IP address and network name, regardless of the piece of hardware on which they are currently running. By preserving the same IP address and network name through a failover, you do not need to reconfigure applications to reconnect following a failover.

Use AdventureWorks; CREATE ASSEMBLY SQLStoredProc from <dir>\SQLStoredProc.dll' WITH PERMISSION_SET = SAFE