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Data Flow Properties that Can Be Set by Using Expressions

The values of certain properties of data flow objects can be specified by using property expressions available on the Data Flow task container.

For information about using property expressions, see Using Property Expressions in Packages.

You can use property expressions to customize configurations for each deployed instance of a package. You can also use property expressions to specify run-time constraints for a package by using the /set option with the dtexec command prompt utility. For example, you can constrain the MaximumThreads used by the Sort transformation, or the MaxMemoryUsage of the Fuzzy Grouping and Fuzzy Lookup transformations. If unconstrained, these transformations may cache large amounts of data in memory.

To specify a property expression for one of the properties of data flow objects listed in this topic, display the Properties window for the Data Flow task by selecting the Data Flow task on the Control Flow surface of the designer, or by selecting the Data Flow tab of the designer without selecting any individual component or path. Select the Expressions property and click the ellipsis (...) to display the Property Expressions Editor dialog box. Drop down the Property list to select a property, then type an expression in the Expression text box, or click the ellipsis (...) to display the Expression Builder dialog box.

The Property list displays available properties for only those data flow objects that you have already placed on the Data Flow surface of the designer. Therefore, you cannot use the Property list to view all the possible properties of data flow objects that support property expressions. For example, if you have placed an ADO NET source on the designer surface, the Property list contains an entry for the [ADO NET Source].[SqlCommand] property. The list also displays many properties of the Data Flow task itself.

The values of the properties in the following list can be specified by using property expressions.

Data Flow Sources

For more information about these custom properties, see Source Custom Properties.

Data Flow object

Property

ADO NET source

TableOrViewName property

SqlCommand property

XML source

XMLData property

XMLSchemaDefinition property

Data Flow Transformations

For more information about these custom properties, see Transformation Custom Properties.

Data Flow object

Property

Conditional Split transformation

FriendlyExpression property

Derived Column transformation

FriendlyExpression property

Fuzzy Grouping transformation

MaxMemoryUsage property

Fuzzy Lookup transformation

MaxMemoryUsage property

Lookup transformation

SqlCommand property

SqlCommandParam property

OLE DB Command transformation

SqlCommand property

Percentage Sampling transformation

SamplingValue property

Pivot transformation

PivotKeyValue property

Row Sampling transformation

SamplingValue property

Sort transformation

MaximumThreads property

Unpivot transformation

PivotKeyValue property

Data Flow Destinations

For more information about these custom properties, see Destination Custom Properties.

Data Flow object

Property

ADO NET Destination

TableOrViewName property

BatchSize property

CommandTimeout property

Flat File destination

Header property

SQL Server Compact destination

TableName property

SQL Server destination

BulkInsertTableName property

BulkInsertFirstRow property

BulkInsertLastRow property

BulkInsertOrder property

Timeout property

Technical article, SSIS Expression Cheat Sheet, on pragmaticworks.com

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