Criando, alterando e removendo índices

Artigo
03/20/2013

Na hierarquia do SQL Server Management Objects (SMO), os índices são representados pelo objeto Index. As colunas indexadas são representadas por uma coleção de objetos IndexedColumn representada pela propriedade IndexedColumns.

Você pode criar um índice em uma coluna de XML especificando a propriedade IsXmlIndex do objeto Index.

Exemplos

Para usar qualquer exemplo de código fornecido, será necessário escolher o ambiente, o modelo e a linguagem de programação para criar o aplicativo. Para obter mais informações, consulte Criar um projeto SMO do Visual Basic no Visual Studio .NET ou Criar um projeto SMO do Visual C# no Visual Studio .NET.

Criando um índice não clusterizado composto no Visual Basic

Este exemplo de código demonstra como criar um índice não clusterizado composto. Para um índice composto, adicione mais de uma coluna ao índice. Defina a propriedade IsClustered como False para um índice não clusterizado.

' /r:Microsoft.SqlServer.Smo.dll
' /r:Microsoft.SqlServer.ConnectionInfo.dll
' /r:Microsoft.SqlServer.SqlEnum.dll
' /r:Microsoft.SqlServer.Management.Sdk.Sfc.dll

Imports Microsoft.SqlServer.Management.Smo
Public Class A
    Public Shared Sub Main()
        ' Connect to the local, default instance of SQL Server. 
        Dim srv As Server
        srv = New Server()

        ' Reference the AdventureWorks2012 database. 
        Dim db As Database
        db = srv.Databases("AdventureWorks2012")

        ' Declare a Table object and reference the HumanResources table. 
        Dim tb As Table
        tb = db.Tables("Employee", "HumanResources")

        ' Define an Index object variable by providing the parent table and index name in the constructor. 
        Dim idx As Index
        idx = New Index(tb, "TestIndex")

        ' Add indexed columns to the index. 
        Dim icol1 As IndexedColumn
        icol1 = New IndexedColumn(idx, "BusinessEntityID", True)
        idx.IndexedColumns.Add(icol1)
        Dim icol2 As IndexedColumn
        icol2 = New IndexedColumn(idx, "HireDate", True)
        idx.IndexedColumns.Add(icol2)

        ' Set the index properties. 
        idx.IndexKeyType = IndexKeyType.DriUniqueKey
        idx.IsClustered = False
        idx.FillFactor = 50

        ' Create the index on the instance of SQL Server. 
        idx.Create()

        ' Modify the page locks property. 
        idx.DisallowPageLocks = True

        ' Run the Alter method to make the change on the instance of SQL Server. 
        idx.Alter()

        ' Remove the index from the table. 
        idx.Drop()
    End Sub
End Class

Criando um índice não clusterizado composto no Visual C#

// /r:Microsoft.SqlServer.Smo.dll
// /r:Microsoft.SqlServer.ConnectionInfo.dll
// /r:Microsoft.SqlServer.SqlEnum.dll
// /r:Microsoft.SqlServer.Management.Sdk.Sfc.dll

using Microsoft.SqlServer.Management.Smo;

public class A {
   public static void Main() {
      // Connect to the local, default instance of SQL Server. 
      Server srv;
      srv = new Server();

      // Reference the AdventureWorks2012 database. 
      Database db;
      db = srv.Databases["AdventureWorks2012"];

      // Declare a Table object and reference the HumanResources table. 
      Table tb;
      tb = db.Tables["Employee", "HumanResources"];

      // Define an Index object variable by providing the parent table and index name in the constructor. 
      Index idx;
      idx = new Index(tb, "TestIndex");

      // Add indexed columns to the index. 
      IndexedColumn icol1;
      icol1 = new IndexedColumn(idx, "BusinessEntityID", true);
      idx.IndexedColumns.Add(icol1);
      IndexedColumn icol2;
      icol2 = new IndexedColumn(idx, "HireDate", true);
      idx.IndexedColumns.Add(icol2);

      // Set the index properties. 
      idx.IndexKeyType = IndexKeyType.DriUniqueKey;
      idx.IsClustered = false;
      idx.FillFactor = 50;

      // Create the index on the instance of SQL Server. 
      idx.Create();

      // Modify the page locks property. 
      idx.DisallowPageLocks = true;

      // Run the Alter method to make the change on the instance of SQL Server. 
      idx.Alter();

      // Remove the index from the table. 
      idx.Drop();
   }
}

Criando um índice composto não clusterizado no PowerShell

# Set the path context to the local, default instance of SQL Server and to the
#database tables in Adventureworks2012
CD \sql\localhost\default\databases\AdventureWorks2012\Tables\

#Get a reference to the table
$tb = get-item HumanResources.Employee

#Define an Index object variable by providing the parent table and index name in the constructor. 
$idx = New-Object -TypeName Microsoft.SqlServer.Management.SMO.Index -argumentlist $tb, "TestIndex"

#Add indexed columns to the index. 
$icol1 = New-Object -TypeName Microsoft.SqlServer.Management.SMO.IndexedColumn `
-argumentlist $idx, "BusinessEntityId", $true
$idx.IndexedColumns.Add($icol1)

$icol2 = New-Object -TypeName Microsoft.SqlServer.Management.SMO.IndexedColumn `
-argumentlist $idx, "HireDate", $true
$idx.IndexedColumns.Add($icol2)

#Set the index properties. 
$idx.IndexKeyType = [Microsoft.SqlServer.Management.SMO.IndexKeyType]::DriUniqueKey 
$idx.IsClustered = $false
$idx.FillFactor = 50

#Create the index on the instance of SQL Server. 
$idx.Create()

#Modify the page locks property. 
$idx.DisallowPageLocks = $true

#Run the Alter method to make the change on the instance of SQL Server. 
$idx.Alter()

#Remove the index from the table. 
$idx.Drop();

Criando um índice XML no Visual Basic

Este exemplo de código mostra como criar um índice XML em um tipo de dados XML. O tipo de dados de XML é uma coleção de esquemas XML chamada MySampleCollection que é criada em Usando esquemas XML. Os índices XML têm algumas restrições; uma delas é que eles devem ser criados em uma tabela que já possui uma chave primária clusterizada.

' /r:Microsoft.SqlServer.Smo.dll
' /r:Microsoft.SqlServer.ConnectionInfo.dll
' /r:Microsoft.SqlServer.SqlEnum.dll
' /r:Microsoft.SqlServer.Management.Sdk.Sfc.dll

Imports Microsoft.SqlServer.Management.Smo

Public Class A
    Public Shared Sub Main()
        ' Connect to the local, default instance of SQL Server. 
        Dim srv As Server
        srv = New Server()
        Dim db1 As Database = srv.Databases("TESTDB")
        ' Define a Table object variable and add an XML type column. 
        Dim tb As New Table(db1, "XmlTable3")

        Dim mySample As New XmlSchemaCollection(db1, "Sample4", "dbo")
        mySample.Text = "<xsd:schema xmlns:xsd=""http://www.w3.org/2001/XMLSchema"" targetNamespace=""NS2""> <xsd:element name=""elem1"" type=""xsd:integer""/></xsd:schema>"
        mySample.Create()

        Dim col11 As Column

        ' This sample requires that an XML schema type called MySampleCollection exists on the database. 
        col11 = New Column(tb, "XMLValue", DataType.Xml("Sample4"))

        ' Add another integer column that can be made into a unique, primary key. 
        tb.Columns.Add(col11)
        Dim col21 As Column
        col21 = New Column(tb, "Number", DataType.Int)
        col21.Nullable = False
        tb.Columns.Add(col21)

        ' Create the table of the instance of SQL Server. 
        tb.Create()

        ' Create a unique, clustered, primary key index on the integer column. This is required for an XML index. 
        Dim cp As Index
        cp = New Index(tb, "clusprimindex3")
        cp.IsClustered = True
        cp.IndexKeyType = IndexKeyType.DriPrimaryKey
        Dim cpcol As IndexedColumn
        cpcol = New IndexedColumn(cp, "Number", True)
        cp.IndexedColumns.Add(cpcol)
        cp.Create()

        ' Define and XML Index object variable by supplying the parent table and the XML index name arguments in the constructor. 
        Dim i As Index
        i = New Index(tb, "xmlindex")
        Dim ic As IndexedColumn
        ic = New IndexedColumn(i, "XMLValue", True)
        i.IndexedColumns.Add(ic)

        ' Create the XML index on the instance of SQL Server. 
        i.Create()
    End Sub
End Class

Criando um índice de XML no Visual C#

// /r:Microsoft.SqlServer.Smo.dll
// /r:Microsoft.SqlServer.ConnectionInfo.dll
// /r:Microsoft.SqlServer.SqlEnum.dll
// /r:Microsoft.SqlServer.Management.Sdk.Sfc.dll

using Microsoft.SqlServer.Management.Smo;

public class A {
   public static void Main() {
      // Connect to the local, default instance of SQL Server. 
      Server srv;
      srv = new Server();
      Database db1 = srv.Databases["TESTDB"];
      // Define a Table object variable and add an XML type column. 
      Table tb = new Table(db1, "XmlTable3");

      XmlSchemaCollection mySample = new XmlSchemaCollection(db1, "Sample4", "dbo");
      mySample.Text = "<xsd:schema xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" targetNamespace=\"NS2\"> <xsd:element name=\"elem1\" type=\"xsd:integer\"/></xsd:schema>";
      mySample.Create();

      Column col11;

      // This sample requires that an XML schema type called MySampleCollection exists on the database. 
      col11 = new Column(tb, "XMLValue", DataType.Xml("Sample4"));

      // Add another integer column that can be made into a unique, primary key. 
      tb.Columns.Add(col11);
      Column col21;
      col21 = new Column(tb, "Number", DataType.Int);
      col21.Nullable = false;
      tb.Columns.Add(col21);

      // Create the table of the instance of SQL Server. 
      tb.Create();

      // Create a unique, clustered, primary key index on the integer column. This is required for an XML index. 
      Index cp;
      cp = new Index(tb, "clusprimindex3");
      cp.IsClustered = true;
      cp.IndexKeyType = IndexKeyType.DriPrimaryKey;
      IndexedColumn cpcol;
      cpcol = new IndexedColumn(cp, "Number", true);
      cp.IndexedColumns.Add(cpcol);
      cp.Create();

      // Define and XML Index object variable by supplying the parent table and the XML index name arguments in the constructor. 
      Index i;
      i = new Index(tb, "xmlindex");
      IndexedColumn ic;
      ic = new IndexedColumn(i, "XMLValue", true);
      i.IndexedColumns.Add(ic);

      // Create the XML index on the instance of SQL Server. 
      i.Create();
   }
}

Criando um índice XML no PowerShell

# Set the path context to the local, default instance of SQL Server and get a reference to adventureworks2012
CD \sql\localhost\default\databases
$db = get-item Adventureworks2012

#Define a Table object variable and add an XML type column. 
#This sample requires that an XML schema type called MySampleCollection exists on the database. 
#See sample on Creating an XML schema to do this
$tb = New-Object -TypeName Microsoft.SqlServer.Management.SMO.Table -argumentlist $db, "XmlTable"
$Type = [Microsoft.SqlServer.Management.SMO.DataType]::Xml("MySampleCollection")
$col1 =  New-Object -TypeName Microsoft.SqlServer.Management.SMO.Column -argumentlist $tb,"XMLValue", $Type
$tb.Columns.Add($col1)

#Add another integer column that can be made into a unique, primary key. 
$Type = [Microsoft.SqlServer.Management.SMO.DataType]::Int
$col2 =  New-Object -TypeName Microsoft.SqlServer.Management.SMO.Column -argumentlist $tb,"Number", $Type
$col2.Nullable = $false
$tb.Columns.Add($col2)
          
#Create the table of the instance of SQL Server. 
$tb.Create()

#Create a unique, clustered, primary key index on the integer column. This is required for an XML index. 
#Define an Index object variable by providing the parent table and index name in the constructor. 
$cp = New-Object -TypeName Microsoft.SqlServer.Management.SMO.Index -argumentlist $tb, "clusprimindex"        
$cp.IsClustered = $true;
$cp.IndexKeyType = [Microsoft.SqlServer.Management.SMO.IndexKeyType]::DriPrimaryKey;

#Create and add an indexed column to the index. 
$cpcol = New-Object -TypeName Microsoft.SqlServer.Management.SMO.IndexedColumn `
-argumentlist $cp, "Number", $true
$cp.IndexedColumns.Add($cpcol)
$cp.Create()

#Define and XML Index object variable by supplying the parent table and
# the XML index name arguments in the constructor. 
$i = New-Object -TypeName Microsoft.SqlServer.Management.SMO.Index -argumentlist $tb, "xmlindex" 

#Create and add an indexed column to the index. 
$ic = New-Object -TypeName Microsoft.SqlServer.Management.SMO.IndexedColumn `
-argumentlist $i, "XMLValue", $true  
$i.IndexedColumns.Add($ic)

#Create the XML index on the instance of SQL Server
$i.Create()

Consulte também

Referência

Index

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