# MemoryDbReservedInstances
<a name="API_CostOptimizationHub_MemoryDbReservedInstances"></a>

The MemoryDB reserved instances recommendation details.

**Note**  
While the API reference uses "MemoryDB reserved instances", the user guide and other documentation refer to them as "MemoryDB reserved nodes", as the terms are used interchangeably.

## Contents
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 ** configuration **   <a name="awscostmanagement-Type-CostOptimizationHub_MemoryDbReservedInstances-configuration"></a>
The MemoryDB reserved instances configuration used for recommendations.  
Type: [MemoryDbReservedInstancesConfiguration](API_CostOptimizationHub_MemoryDbReservedInstancesConfiguration.md) object  
Required: No

 ** costCalculation **   <a name="awscostmanagement-Type-CostOptimizationHub_MemoryDbReservedInstances-costCalculation"></a>
Cost impact of the purchase recommendation.  
Type: [ReservedInstancesCostCalculation](API_CostOptimizationHub_ReservedInstancesCostCalculation.md) object  
Required: No

## 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 SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/cost-optimization-hub-2022-07-26/MemoryDbReservedInstances) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/cost-optimization-hub-2022-07-26/MemoryDbReservedInstances) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/cost-optimization-hub-2022-07-26/MemoryDbReservedInstances)