Statistic.Update 方法 (StatisticsScanType)
Updates information about the distribution of key values.
命名空間： Microsoft.SqlServer.Management.Smo
組件： Microsoft.SqlServer.Smo (在 Microsoft.SqlServer.Smo.dll 中)
語法
'宣告
Public Sub Update ( _
scanType As StatisticsScanType _
)
'用途
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
)
參數
備註
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 |