# Parameter


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

## Contents


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

 ** AllowedValues **   
The valid range of values for the parameter.  
Type: String  
Required: No

 ** ChangeType **   
Indicates whether a change to the parameter is applied immediately or requires a reboot for the change to be applied. You can force a reboot or wait until the next maintenance window's reboot. For more information, see [Rebooting a Cluster](https://docs.aws.amazon.com/AmazonElastiCache/latest/dg/Clusters.Rebooting.html).  
Type: String  
Valid Values: `immediate | requires-reboot`   
Required: No

 ** DataType **   
The valid data type for the parameter.  
Type: String  
Required: No

 ** Description **   
A description of the parameter.  
Type: String  
Required: No

 ** IsModifiable **   
Indicates whether (`true`) or not (`false`) the parameter can be modified. Some parameters have security or operational implications that prevent them from being changed.  
Type: Boolean  
Required: No

 ** MinimumEngineVersion **   
The earliest cache engine version to which the parameter can apply.  
Type: String  
Required: No

 ** ParameterName **   
The name of the parameter.  
Type: String  
Required: No

 ** ParameterValue **   
The value of the parameter.  
Type: String  
Required: No

 ** Source **   
The source of the 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/elasticache-2015-02-02/Parameter) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/elasticache-2015-02-02/Parameter) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/elasticache-2015-02-02/Parameter)