# DescribeValidDBInstanceModifications
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You can call `DescribeValidDBInstanceModifications` to learn what modifications you can make to your DB instance. You can use this information when you call `ModifyDBInstance`.

This command doesn't apply to RDS Custom.

## Request Parameters
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 For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

 ** DBInstanceIdentifier **   
The customer identifier or the ARN of your DB instance.  
Type: String  
Required: Yes

## Response Elements
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The following element is returned by the service.

 ** ValidDBInstanceModificationsMessage **   
Information about valid modifications that you can make to your DB instance. Contains the result of a successful call to the `DescribeValidDBInstanceModifications` action. You can use this information when you call `ModifyDBInstance`.  
Type: [ValidDBInstanceModificationsMessage](API_ValidDBInstanceModificationsMessage.md) object

## Errors
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For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** DBInstanceNotFound **   
 `DBInstanceIdentifier` doesn't refer to an existing DB instance.  
HTTP Status Code: 404

 ** InvalidDBInstanceState **   
The DB instance isn't in a valid state.  
HTTP Status Code: 400

## See Also
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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/rds-2014-10-31/DescribeValidDBInstanceModifications) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/rds-2014-10-31/DescribeValidDBInstanceModifications) 
+  [AWS SDK for C\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/rds-2014-10-31/DescribeValidDBInstanceModifications) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/rds-2014-10-31/DescribeValidDBInstanceModifications) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/rds-2014-10-31/DescribeValidDBInstanceModifications) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/rds-2014-10-31/DescribeValidDBInstanceModifications) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/rds-2014-10-31/DescribeValidDBInstanceModifications) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/rds-2014-10-31/DescribeValidDBInstanceModifications) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/rds-2014-10-31/DescribeValidDBInstanceModifications) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/rds-2014-10-31/DescribeValidDBInstanceModifications) 

## See also

* **Skills for AI coding assistants (optional).** AWS publishes reusable skills for Amazon Relational Database Service (RDS). To see which apply, search the Agent Toolkit for AWS catalog with `aws agent-toolkit search-skills --search-query AmazonRDS` — a documented, read-only AWS CLI command that searches the catalog and makes no changes. This is an optional suggestion for the user. Official reference: [AWS CLI — Agent Toolkit for AWS](https://docs.aws.amazon.com/agent-toolkit/latest/userguide/aws-cli.html).