# LookbackWindow
<a name="API_LookbackWindow"></a>

The lookback window setup of an incremental refresh configuration.

## Contents
<a name="API_LookbackWindow_Contents"></a>

**Note**  
In the following list, the required parameters are described first.

 ** ColumnName **   <a name="QS-Type-LookbackWindow-ColumnName"></a>
The name of the lookback window column.  
Type: String  
Required: Yes

 ** Size **   <a name="QS-Type-LookbackWindow-Size"></a>
The lookback window column size.  
Type: Long  
Valid Range: Minimum value of 1.  
Required: Yes

 ** SizeUnit **   <a name="QS-Type-LookbackWindow-SizeUnit"></a>
The size unit that is used for the lookback window column. Valid values for this structure are `HOUR`, `DAY`, and `WEEK`.  
Type: String  
Valid Values: `HOUR | DAY | WEEK`   
Required: Yes

## See Also
<a name="API_LookbackWindow_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/quicksight-2018-04-01/LookbackWindow) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/quicksight-2018-04-01/LookbackWindow) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/quicksight-2018-04-01/LookbackWindow)