# RetentionProperties
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Retention properties contain the duration for which your time-series data must be stored in the magnetic store and the memory store. 

## Contents
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 ** MagneticStoreRetentionPeriodInDays **   <a name="timestream-Type-RetentionProperties-MagneticStoreRetentionPeriodInDays"></a>
The duration for which data must be stored in the magnetic store.   
Type: Long  
Valid Range: Minimum value of 1. Maximum value of 73000.  
Required: Yes

 ** MemoryStoreRetentionPeriodInHours **   <a name="timestream-Type-RetentionProperties-MemoryStoreRetentionPeriodInHours"></a>
The duration for which data must be stored in the memory store.   
Type: Long  
Valid Range: Minimum value of 1. Maximum value of 8766.  
Required: Yes

## 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/timestream-write-2018-11-01/RetentionProperties) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/timestream-write-2018-11-01/RetentionProperties) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/timestream-write-2018-11-01/RetentionProperties)