• Article

Lookup Transformation Editor (Advanced Page)

Use the Advanced page of the Lookup Transformation Editor dialog box to configure partial caching and to modify the SQL statement for the Lookup transformation.

To learn more about the Lookup transformation, see Lookup Transformation.

Options

  • Cache size (32-bit)
    Adjust the cache size (in megabytes) for 32-bit computers. The default value is 5 megabytes.

  • Cache size (64-bit)
    Adjust the cache size (in megabytes) for 64-bit computers. The default value is 5 megabytes.

  • Enable cache for rows with no matching entries
    Cache rows with no matching entries in the reference dataset. Selecting this option prevents the Lookup transformation from querying the database multiple times for values that don’t exist.

    In certain cases you don’t want to cache the rows with no matching entries such as when the data flow is adding new rows to the reference dataset.

  • Allocation from cache
    Specify the percentage of the cache to allocate for rows with no matching entries in the reference dataset.

  • Modify the SQL statement
    Modify the SQL statement that is used to generate the reference dataset.

<div class="alert">


> [!NOTE]
> <P>The optional SQL statement that you specify on this page overrides and replaces the table name that you specified on the <STRONG>Connection</STRONG> page of the <STRONG>Lookup Transformation Editor</STRONG>. For more information, see <A href="ms189697(v=sql.105).md">Lookup Transformation Editor (Connection Page)</A>.</P>


</div>
  • Set Parameters
    Map input columns to parameters by using the Set Query Parameters dialog box.

External Resources

Blog entry, Lookup cache modes on blogs.msdn.com

Change History

Updated Content

Provided additional information about the Enable cache for rows with no matching entries option.