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You use cluster groups to combine one or more cluster resources into a logical man agement structure. The unit of failover within a cluster is a group. It can be helpful to think of a cluster group as an application. Each SQL Server failover cluster instance that you create appears as a separate group within a Windows cluster. A cluster group, along with the resources contained within the group, is shown in Figure 8-2.

Figure 8-2

You can select SQL Server Profiler event classes to include in traces that produce estimated and actual execution plans in XML or text. To display execution plan information by using these event classes, you must also include the appropriate Transact-SQL statements to turn on for example, STATISTICS IO or SHOWPLAN_XML. The following event classes are used in SQL Server 2005.

The final step is to create a stored procedure that references the SQLStoredProc assembly. For example, the following Transact-SQL statement can be used to reference the assembly using its external name:

1. What is the main difference between a standard cluster and a majority node set cluster 2. What are some examples of cluster resources

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Use AdventureWorks; CREATE PROCEDURE GetTomorrowsDate AS EXTERNAL NAME SQLStoredProc.CLRStoredProc.GetTomorrowsDate

3. How many network connections does a node need for clustering Why 4. How does the health check within a Windows cluster work 5. Which types of disk configurations are supported for clustering

Showplan XML Captures the estimated execution plan in XML format with full compile-time details in the TextData data column of the trace.

Now that the procedure has been created, we can execute it just like any Transact-SQL stored procedure. For example, the following Transact-SQL statement will return tomorrow s date in the messages window:

1. A standard cluster uses a shared quorum database. A majority node set cluster maintains a separate quorum database on each node that is syn chronized across all nodes. The majority of nodes (more than 50 percent) must be online for a majority node set cluster to function. 2. Cluster resources can be hardware, software, or networking. Some exam ples are IP addresses, network names, disk mounts, and Windows services. 3. Each node needs at least two network connections: One connection is used for public communications to applications on the network, and the other is used for private internal communications. 4. The basic health check that is performed is called a LooksAlive test. This test consists of each node pinging the others. 5. Clustering supports basic disks. Dynamic disks are not supported. Disks must also be external to each node within the cluster, so disks mounted locally within a cluster are not visible to any resource within a cluster.

In this exercise, you create a Windows cluster that you will use in the next lesson to install a SQL Server failover cluster instance. 1. Launch the Virtual Server Administration Web site. 2. Launch the Virtual Machine Remote Control Client, and connect to your Virtual Server instance. 3. Verify that Node1 and Node2 are off. Start the domain controller (hereafter referred to as DC). 4. Under the Virtual Disks section of the Virtual Server Administration Web site, choose Create and then Fixed Size Virtual Hard Disk. 5. Name this disk quorum.vhd with a size of 500 MB. 6. Repeat steps 4 and 5 to create two more disks: sqldata.vhd with a size of 1 GB and sqllog.vhd with a size of 500 MB.

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7. Within the Virtual Server Administration Web site, click Edit Configuration for the first node in your cluster (hereafter referred to as Node1). 8. Verify that you have configured two network adapters. If you do not have two network adapters configured, add a second network adapter. 9. Click the SCSI Adapters link. 10. Add three small computer system interface (SCSI) adapters with the SCSI Adapter ID set to 6 and the Share SCSI Bus For Clustering check box selected, as shown in Table 8-5.

A table scan can also occur when the table does not have an index that satisfies the query. However, it can be argued that this situation is caused by poor query design because required indexes do not exist or because queries are not designed to take advantage of existing indexes.

Table 8-5