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Update 方法 (StatisticsScanType)

Updates information about the distribution of key values.

命名空间：  Microsoft.SqlServer.Management.Smo
程序集：  Microsoft.SqlServer.Smo（在 Microsoft.SqlServer.Smo.dll 中）

语法

声明
Public Sub Update ( _
    scanType As StatisticsScanType _
)
用法
Dim instance As Statistic
Dim scanType As StatisticsScanType

instance.Update(scanType)

public void Update(
    StatisticsScanType scanType
)

public:
void Update(
    StatisticsScanType scanType
)

member Update : 
        scanType:StatisticsScanType -> unit 

public function Update(
    scanType : StatisticsScanType
)

注释

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