Statistic.Update 方法 (StatisticsScanType, Int32)
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, _
sampleValue As Integer _
)
用法
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
)
参数
- sampleValue
类型：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.
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 |