Udostępnij za pośrednictwem

  • Artykuł

Statistic.Update Method (StatisticsScanType, Int32, Boolean)

Updates information about the distribution of key values.

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

Syntax

'Deklaracja
Public Sub Update ( _
    scanType As StatisticsScanType, _
    sampleValue As Integer, _
    recompute As Boolean _
)

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

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

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

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

Parameters

  • sampleValue
    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
    Boolean - Specifies if statistics that are out of date are automatically recomputed

Remarks

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

Thread Safety

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Development Platforms

For a list of the supported platforms, see Hardware and Software Requirements for Installing SQL Server.

Target Platforms

For a list of the supported platforms, see Hardware and Software Requirements for Installing SQL Server.