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Creating or modifying a table and specifying the PRIMARY KEY or UNIQUE constraint enforces the uniqueness of rows and implicitly creates an index to do so. This index is clustered by default. A table typically has a column or combination of columns that contains values that uniquely identify each row in the table. This column, or columns, is called the primary key (PK) of the table and enforces the entity integrity of the table. You can create a PK by defining a PRIMARY KEY constraint when you create or modify a table. A table can have only one PRIMARY KEY constraint, and a column that participates in the PRIMARY KEY constraint cannot accept null values. Because PRIMARY KEY constraints guarantee unique data, they are frequently defined on an identity column. When you specify a PRIMARY KEY constraint for a table, the SQL Server 2005 database engine enforces data uniqueness by creating a unique index for the primary key columns. This index also permits fast access to data when the PK is used in queries. Therefore, the PKs that are chosen must follow the rules for creating unique indexes. If you define a PRIMARY KEY constraint on more than one column, values can be duplicated within one column, but each combination of values from all the columns in the PRIMARY KEY constraint definition must be unique.

Database Mirroring, new in Microsoft SQL Server 2005, provides a fault-tolerant alter native to SQL Server failover clustering while also allowing failure protection to be limited to one or more databases instead of the entire instance. This chapter explains how to design and deploy Database Mirroring. The final lesson within this chapter discusses various failure scenarios and how Database Mirroring can deal with each type of failure to keep your databases online.

8. Paste the following code below the Form1_load method. Modify connection strings to match your environment.

This chapter covers the basic Database Mirroring information you need to pass the 70-443 exam. For full details about Database Mirroring, see the white paper, Database Mirroring in SQL Server 2005, by Ron Talmage at www.microsoft.com/technet/prodtechnol/sql/2005/dbmirror.mspx.

Exam objectives in this chapter:

When you specify a UNIQUE constraint, a unique nonclustered index is created to enforce the constraint. You can specify a unique clustered index if a clustered index on the table does not already exist. You can also create a unique index independent of a constraint and define multiple unique nonclustered indexes on a table. To create an indexed view, you define a unique clustered index on one or more view columns. The view is executed (materialized), and the result set is stored in the leaf level of the index in the same way table data is stored in a clustered index.

//C# private void btnOpen_Click(object sender, EventArgs e) { try { //Open the Connection to SQL Server Express using ADO.NET string connString = @"server=(local);" + "Integrated Security=SSPI;" + "Database=AdventureWorks"; sqlConn = new SqlConnection(connString); sqlConn.Open();

Design server roles for database mirroring. Design the initialization of database mirroring. Design a test strategy for planned and unplanned role changes.

MessageBox.Show("Connection was successful"); } catch (Exception ex) { MessageBox.Show(ex.Message); } } 'VB Private Sub btnOpen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOpen.Click Try 'Open the Connection to SQL Server using ADO.NET Dim connString As String = "server=(local);" & _ "Integrated Security=SSPI;" & _ "Database=AdventureWorks" Dim sqlConn As New SqlConnection sqlConn.ConnectionString = connString sqlConn.Open() MessageBox.Show("Connection was successful") Catch ex As Exception MessageBox.Show(ex.Message) End Try End Sub

Lessons in this chapter:

Lesson 1: Overview of Database Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315 Lesson 2: Initializing Database Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 Lesson 3: Designing Failover and Failback Strategies . . . . . . . . . . . . . . . . . . . 335