# Parameter


Describes an individual setting that controls some aspect of DAX behavior.

## Contents


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

 ** AllowedValues **   <a name="DDB-Type-dax_Parameter-AllowedValues"></a>
A range of values within which the parameter can be set.  
Type: String  
Required: No

 ** ChangeType **   <a name="DDB-Type-dax_Parameter-ChangeType"></a>
The conditions under which changes to this parameter can be applied. For example, `requires-reboot` indicates that a new value for this parameter will only take effect if a node is rebooted.  
Type: String  
Valid Values: `IMMEDIATE | REQUIRES_REBOOT`   
Required: No

 ** DataType **   <a name="DDB-Type-dax_Parameter-DataType"></a>
The data type of the parameter. For example, `integer`:  
Type: String  
Required: No

 ** Description **   <a name="DDB-Type-dax_Parameter-Description"></a>
A description of the parameter  
Type: String  
Required: No

 ** IsModifiable **   <a name="DDB-Type-dax_Parameter-IsModifiable"></a>
Whether the customer is allowed to modify the parameter.  
Type: String  
Valid Values: `TRUE | FALSE | CONDITIONAL`   
Required: No

 ** NodeTypeSpecificValues **   <a name="DDB-Type-dax_Parameter-NodeTypeSpecificValues"></a>
A list of node types, and specific parameter values for each node.  
Type: Array of [NodeTypeSpecificValue](API_dax_NodeTypeSpecificValue.md) objects  
Required: No

 ** ParameterName **   <a name="DDB-Type-dax_Parameter-ParameterName"></a>
The name of the parameter.  
Type: String  
Required: No

 ** ParameterType **   <a name="DDB-Type-dax_Parameter-ParameterType"></a>
Determines whether the parameter can be applied to any nodes, or only nodes of a particular type.  
Type: String  
Valid Values: `DEFAULT | NODE_TYPE_SPECIFIC`   
Required: No

 ** ParameterValue **   <a name="DDB-Type-dax_Parameter-ParameterValue"></a>
The value for the parameter.  
Type: String  
Required: No

 ** Source **   <a name="DDB-Type-dax_Parameter-Source"></a>
How the parameter is defined. For example, `system` denotes a system-defined parameter.  
Type: String  
Required: No

## See Also


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/dax-2017-04-19/Parameter) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/dax-2017-04-19/Parameter) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/dax-2017-04-19/Parameter)