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  • Articolo

Metodo Update (StatisticsScanType, Int32)

Updates information about the distribution of key values.

Spazio dei nomi:  Microsoft.SqlServer.Management.Smo
Assembly:  Microsoft.SqlServer.Smo (in Microsoft.SqlServer.Smo.dll)

Sintassi

'Dichiarazione
Public Sub Update ( _
    scanType As StatisticsScanType, _
    sampleValue As Integer _
)
'Utilizzo
Dim instance As Statistic
Dim scanType As StatisticsScanType
Dim sampleValue As Integer

instance.Update(scanType, sampleValue)

public void Update(
    StatisticsScanType scanType,
    int sampleValue
)

public:
void Update(
    StatisticsScanType scanType, 
    int sampleValue
)

member Update : 
        scanType:StatisticsScanType * 
        sampleValue:int -> unit 

public function Update(
    scanType : StatisticsScanType, 
    sampleValue : int
)

Parametri

  • sampleValue
    Tipo: System. . :: . .Int32
    Int32 - Specifies the percentage of the table or indexed view, or the number of rows to sample when collecting statistics for larger tables or views.

Osservazioni

StatisticsScanType are listed in the following table.

Member

Description

Default

Value = 5. Specifies that a percentage of the table or indexed view is used when collecting statistics. The actual percentage is calculated by the SQL Server engine automatically.

FullScan

Value = 3. Specifies that all rows in the table or view are read when gathering statistics. This option must be used if a view is specified and it references more than one table.

Percent

Value = 1. Specifies that a percentage of the table or indexed view is used when collecting statistics. This options cannot be used if a view is specified and it references more than one table. When specified, use the sampleValue argument to indicate number of rows.

Resample

Value = 4. Specifies that the percentage ratio of the table or indexed view used when collecting statistics is inherited from existing the statistics

Rows

Value = 2. Specifies that a number of rows in the table or indexed view are used when collecting statistics. This option cannot be used if a view is specified and it references more than one table. When specified, use the sampleValue argument to indicate number of rows