# UpdateDimension


Updates the definition for a dimension. You cannot change the type of a dimension after it is created (you can delete it and recreate it).

Requires permission to access the [UpdateDimension](https://docs.aws.amazon.com/service-authorization/latest/reference/list_awsiot.html#awsiot-actions-as-permissions) action.

## Request Syntax


```
PATCH /dimensions/name HTTP/1.1
Content-type: application/json

{
   "stringValues": [ "string" ]
}
```

## URI Request Parameters


The request uses the following URI parameters.

 ** [name](#API_UpdateDimension_RequestSyntax) **   <a name="iot-UpdateDimension-request-uri-name"></a>
A unique identifier for the dimension. Choose something that describes the type and value to make it easy to remember what it does.  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `[a-zA-Z0-9:_-]+`   
Required: Yes

## Request Body


The request accepts the following data in JSON format.

 ** [stringValues](#API_UpdateDimension_RequestSyntax) **   <a name="iot-UpdateDimension-request-stringValues"></a>
Specifies the value or list of values for the dimension. For `TOPIC_FILTER` dimensions, this is a pattern used to match the MQTT topic (for example, "admin/\$1").  
Type: Array of strings  
Array Members: Minimum number of 1 item. Maximum number of 100 items.  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Required: Yes

## Response Syntax


```
HTTP/1.1 200
Content-type: application/json

{
   "arn": "string",
   "creationDate": number,
   "lastModifiedDate": number,
   "name": "string",
   "stringValues": [ "string" ],
   "type": "string"
}
```

## Response Elements


If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

 ** [arn](#API_UpdateDimension_ResponseSyntax) **   <a name="iot-UpdateDimension-response-arn"></a>
The Amazon Resource Name (ARN)of the created dimension.  
Type: String

 ** [creationDate](#API_UpdateDimension_ResponseSyntax) **   <a name="iot-UpdateDimension-response-creationDate"></a>
The date and time, in milliseconds since epoch, when the dimension was initially created.  
Type: Timestamp

 ** [lastModifiedDate](#API_UpdateDimension_ResponseSyntax) **   <a name="iot-UpdateDimension-response-lastModifiedDate"></a>
The date and time, in milliseconds since epoch, when the dimension was most recently updated.  
Type: Timestamp

 ** [name](#API_UpdateDimension_ResponseSyntax) **   <a name="iot-UpdateDimension-response-name"></a>
A unique identifier for the dimension.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `[a-zA-Z0-9:_-]+` 

 ** [stringValues](#API_UpdateDimension_ResponseSyntax) **   <a name="iot-UpdateDimension-response-stringValues"></a>
The value or list of values used to scope the dimension. For example, for topic filters, this is the pattern used to match the MQTT topic name.  
Type: Array of strings  
Array Members: Minimum number of 1 item. Maximum number of 100 items.  
Length Constraints: Minimum length of 1. Maximum length of 256.

 ** [type](#API_UpdateDimension_ResponseSyntax) **   <a name="iot-UpdateDimension-response-type"></a>
The type of the dimension.  
Type: String  
Valid Values: `TOPIC_FILTER` 

## Errors


 ** InternalFailureException **   
An unexpected error has occurred.    
 ** message **   
The message for the exception.
HTTP Status Code: 500

 ** InvalidRequestException **   
The request is not valid.    
 ** message **   
The message for the exception.
HTTP Status Code: 400

 ** ResourceNotFoundException **   
The specified resource does not exist.    
 ** message **   
The message for the exception.
HTTP Status Code: 404

 ** ThrottlingException **   
The rate exceeds the limit.    
 ** message **   
The message for the exception.
HTTP Status Code: 400

## See Also


For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/iot-2015-05-28/UpdateDimension) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/iot-2015-05-28/UpdateDimension) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/iot-2015-05-28/UpdateDimension) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/iot-2015-05-28/UpdateDimension) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/iot-2015-05-28/UpdateDimension) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/iot-2015-05-28/UpdateDimension) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/iot-2015-05-28/UpdateDimension) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/iot-2015-05-28/UpdateDimension) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/iot-2015-05-28/UpdateDimension) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/iot-2015-05-28/UpdateDimension)