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After you build and configure the Windows cluster, you can install instances of SQL Server into the cluster. Clustered instances provide fault tolerance to SQL Server by ensuring that a hardware failure cannot cause an extended outage for applications. This lesson explains how to install and configure SQL Server 2005 failover cluster instances for optimal redundancy in a cluster.

public class TK4428 { [Microsoft.SqlServer.Server.SqlFunction(DataAccess=DataAccessKind.Read, IsDeterministic=true)] public static Int32 GetProductID(String prodNumber)

After this lesson, you will be able to:

USE AdventureWorks GO SELECT Title, LoginID FROM HumanResources.Employees WHERE SUBSTRING(Title,1,1) = 'P'

A little more than two years ago, we were at a customer site to help implement clustering. Instead of starting with the installation and configuration of cluster ing, we had to back up and explain clustering. Some consultant told employees of this company that clustering could be used to eliminate downtime when ser vice packs were installed and enable them to load-balance their hardware resources. They were also told that clustering could enable a transaction that started on one node to be completed after the cluster failed over. Clustering does not have the capability to do any of these things. SQL Server failover clustering provides protection against hardware failures. In the event of a failure of one piece of hardware, a second piece of hardware automatically takes over and starts up SQL Server. Service packs still cause an outage on a cluster because the SQL Server instance can exist on only a single node at any time. Any transactions that are not completed when a cluster fails over are rolled back. Because SQL Server does not allow multiple processes to simultaneously access database files, load balancing is not possible. After explaining that clustering only protects from hardware failures, we still implemented the cluster within the customer s environment. The customer could effectively manage the database within the cluster by understanding that failures would still incur outages, but the amount of downtime because of hard ware failure would be minimal.

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{ SqlCommand cmd; Int32 ret = 0; //Connect to the context connection SqlConnection conn = new SqlConnection("Context Connection=true"); conn.Open();

SQL Server instances installed into a cluster have been referred to by several different terminologies, many of which are inaccurate. So, before explaining the SQL Server configuration within a cluster, all the terminology issues will be addressed. SQL Server clusters are either single- or multiple-instance clusters. A single-instance cluster is a Windows cluster that has exactly one instance of SQL Server installed. A multiple-instance cluster is a Windows cluster that has more than one instance of SQL Server installed. It does not matter which node you configure instances to run on; the terminology stays the same. Active/Active and Active/Passive clusters exist at a Windows level. An Active/Active cluster indicates that applications are running on all the nodes in a cluster. An Active/ Passive cluster indicates that applications are running on only a single node in the cluster. This is irrelevant as far as SQL Server is concerned because SQL Server is either running or not. SQL Server instances are unaware of any other SQL Server instances. SQL Server cannot be load-balanced. So SQL Server is running on one of the nodes; the node that SQL Server is running on is left to the whim of the database administrator (DBA) who manages the cluster. SQL Server instances installed into a cluster used to be referred to as Virtual Servers. This terminology created a fundamental problem because Microsoft has a stand-alone product that is called Virtual Server. Instances of SQL Server in a cluster are referred to as either SQL Server clustered instances or SQL Server failover clustered instances.

Not only does this approach perform an unnecessary substring operation on every row, it also performs a table scan rather than use an index. The following query returns the same results more efficiently (even though the LIKE operator is slower than the = operator):

When installing a stand-alone instance, DBAs are not concerned with IP addresses, network names, or even the presence of disk drives. Each of these components needs to be considered when installing a SQL Server instance into a cluster. The components that you need to configure for a SQL Server failover clustered instance are the following: