# VectorIndexInfo
<a name="API_VectorIndexInfo"></a>

Contains the configuration of a vector index as it existed at the time a backup was created.

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

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

 ** Dimensions **   <a name="DDB-Type-VectorIndexInfo-Dimensions"></a>
The number of dimensions in each vector.  
Type: Long  
Valid Range: Minimum value of 1.  
Required: No

 ** DistanceFunction **   <a name="DDB-Type-VectorIndexInfo-DistanceFunction"></a>
The distance function used to calculate similarity between vectors.  
Type: String  
Valid Values: `COSINE | DOT_PRODUCT | EUCLIDEAN`   
Required: No

 ** IndexName **   <a name="DDB-Type-VectorIndexInfo-IndexName"></a>
The name of the vector index.  
Type: String  
Length Constraints: Minimum length of 3. Maximum length of 255.  
Pattern: `[a-zA-Z0-9_.-]+`   
Required: No

 ** Projection **   <a name="DDB-Type-VectorIndexInfo-Projection"></a>
Specifies attributes that are copied (projected) from the table into the vector index.  
Type: [Projection](API_Projection.md) object  
Required: No

 ** SearchSchema **   <a name="DDB-Type-VectorIndexInfo-SearchSchema"></a>
The search schema that defines partition key and inline filter attributes for the vector index.  
Type: Array of [SearchSchemaElement](API_SearchSchemaElement.md) objects  
Array Members: Minimum number of 1 item.  
Required: No

 ** VectorAttribute **   <a name="DDB-Type-VectorIndexInfo-VectorAttribute"></a>
The vector attribute configuration for the index.  
Type: [VectorAttributeDefinition](API_VectorAttributeDefinition.md) object  
Required: No

## See Also
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For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\+\+](https://docs.amazonaws.cn/goto/SdkForCpp/dynamodb-2012-08-10/VectorIndexInfo) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/dynamodb-2012-08-10/VectorIndexInfo) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/dynamodb-2012-08-10/VectorIndexInfo)