Statistic.Update-Methode (StatisticsScanType, Int32, Boolean)

Artikel
07/13/2013

Updates information about the distribution of key values.

Namespace: Microsoft.SqlServer.Management.Smo
Assembly: Microsoft.SqlServer.Smo (in Microsoft.SqlServer.Smo.dll)

Syntax

'Declaration
Public Sub Update ( _
    scanType As StatisticsScanType, _
    sampleValue As Integer, _
    recompute As Boolean _
)
'Usage
Dim instance As Statistic 
Dim scanType As StatisticsScanType 
Dim sampleValue As Integer 
Dim recompute As Boolean

instance.Update(scanType, sampleValue, _
    recompute)

public void Update(
    StatisticsScanType scanType,
    int sampleValue,
    bool recompute
)

public:
void Update(
    StatisticsScanType scanType, 
    int sampleValue, 
    bool recompute
)

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

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

Parameter

scanType
Typ: Microsoft.SqlServer.Management.Smo.StatisticsScanType
StatisticsScanType

sampleValue
Typ: 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.

recompute
Typ: System.Boolean
Boolean - Specifies if statistics that are out of date are automatically recomputed

Hinweise

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

Siehe auch

Verweis

Statistic Klasse

Update-Überladung

Microsoft.SqlServer.Management.Smo-Namespace

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